diff --git a/dlls/uiautomationcore/uia_client.c b/dlls/uiautomationcore/uia_client.c
index d9a13647246..1bffb571586 100644
--- a/dlls/uiautomationcore/uia_client.c
+++ b/dlls/uiautomationcore/uia_client.c
@@ -39,7 +39,7 @@ static void clear_node_array(struct uia_node_array *nodes)
         for (i = 0; i < nodes->node_count; i++)
             UiaNodeRelease(nodes->nodes[i]);
 
-        heap_free(nodes->nodes);
+        free(nodes->nodes);
     }
 
     memset(nodes, 0, sizeof(*nodes));
@@ -429,7 +429,7 @@ static ULONG WINAPI uia_node_Release(IWineUiaNode *iface)
         if (node->nested_node)
             uia_stop_provider_thread();
 
-        heap_free(node);
+        free(node);
     }
 
     return ref;
@@ -697,7 +697,7 @@ HRESULT clone_uia_node(HUIANODE in_node, HUIANODE *out_node)
         }
     }
 
-    if (!(node = heap_alloc_zero(sizeof(*node))))
+    if (!(node = calloc(1, sizeof(*node))))
         return E_OUTOFMEMORY;
 
     node->IWineUiaNode_iface.lpVtbl = &uia_node_vtbl;
@@ -1327,7 +1327,7 @@ static ULONG WINAPI uia_provider_Release(IWineUiaProvider *iface)
     if (!ref)
     {
         IRawElementProviderSimple_Release(prov->elprov);
-        heap_free(prov);
+        free(prov);
     }
 
     return ref;
@@ -1919,7 +1919,7 @@ static const IWineUiaProviderVtbl uia_provider_vtbl = {
 static HRESULT create_wine_uia_provider(struct uia_node *node, IRawElementProviderSimple *elprov,
         int prov_type)
 {
-    struct uia_provider *prov = heap_alloc_zero(sizeof(*prov));
+    struct uia_provider *prov = calloc(1, sizeof(*prov));
 
     if (!prov)
         return E_OUTOFMEMORY;
@@ -1967,7 +1967,7 @@ HRESULT create_uia_node_from_elprov(IRawElementProviderSimple *elprov, HUIANODE
     else
         prov_type = PROV_TYPE_MAIN;
 
-    node = heap_alloc_zero(sizeof(*node));
+    node = calloc(1, sizeof(*node));
     if (!node)
         return E_OUTOFMEMORY;
 
@@ -1980,7 +1980,7 @@ HRESULT create_uia_node_from_elprov(IRawElementProviderSimple *elprov, HUIANODE
     hr = create_wine_uia_provider(node, elprov, prov_type);
     if (FAILED(hr))
     {
-        heap_free(node);
+        free(node);
         return hr;
     }
 
@@ -2222,7 +2222,7 @@ static ULONG WINAPI uia_nested_node_provider_Release(IWineUiaProvider *iface)
     {
         IWineUiaNode_Release(prov->nested_node);
         uia_stop_client_thread();
-        heap_free(prov);
+        free(prov);
     }
 
     return ref;
@@ -2447,7 +2447,7 @@ static HRESULT create_wine_uia_nested_node_provider(struct uia_node *node, LRESU
     }
     else
     {
-        prov = heap_alloc_zero(sizeof(*prov));
+        prov = calloc(1, sizeof(*prov));
         if (!prov)
             return E_OUTOFMEMORY;
 
@@ -2493,7 +2493,7 @@ HRESULT uia_node_from_lresult(LRESULT lr, HUIANODE *huianode)
     HRESULT hr;
 
     *huianode = NULL;
-    node = heap_alloc_zero(sizeof(*node));
+    node = calloc(1, sizeof(*node));
     if (!node)
         return E_OUTOFMEMORY;
 
@@ -2506,7 +2506,7 @@ HRESULT uia_node_from_lresult(LRESULT lr, HUIANODE *huianode)
     hr = create_wine_uia_nested_node_provider(node, lr, FALSE);
     if (FAILED(hr))
     {
-        heap_free(node);
+        free(node);
         return hr;
     }
 
@@ -2577,7 +2577,7 @@ HRESULT WINAPI UiaNodeFromHandle(HWND hwnd, HUIANODE *huianode)
     if (!IsWindow(hwnd))
         return UIA_E_ELEMENTNOTAVAILABLE;
 
-    node = heap_alloc_zero(sizeof(*node));
+    node = calloc(1, sizeof(*node));
     if (!node)
         return E_OUTOFMEMORY;
 
@@ -2590,7 +2590,7 @@ HRESULT WINAPI UiaNodeFromHandle(HWND hwnd, HUIANODE *huianode)
     hr = uia_get_providers_for_hwnd(node);
     if (FAILED(hr))
     {
-        heap_free(node);
+        free(node);
         return hr;
     }
 
@@ -3515,7 +3515,7 @@ HRESULT WINAPI UiaFind(HUIANODE huianode, struct UiaFindParams *find_params, str
         goto exit;
     }
 
-    if (!(tmp_reqs = heap_alloc_zero(sizeof(*tmp_reqs) * nodes.node_count)))
+    if (!(tmp_reqs = calloc(nodes.node_count, sizeof(*tmp_reqs))))
     {
         hr = E_OUTOFMEMORY;
         goto exit;
@@ -3555,7 +3555,7 @@ HRESULT WINAPI UiaFind(HUIANODE huianode, struct UiaFindParams *find_params, str
     if (nodes.node_count == 1)
     {
         req = tmp_reqs[0];
-        heap_free(tmp_reqs);
+        free(tmp_reqs);
         tmp_reqs = NULL;
     }
     else
@@ -3586,7 +3586,7 @@ exit:
     {
         for (i = 0; i < nodes.node_count; i++)
             SafeArrayDestroy(tmp_reqs[i]);
-        heap_free(tmp_reqs);
+        free(tmp_reqs);
     }
 
     if (FAILED(hr))
diff --git a/dlls/uiautomationcore/uia_com_client.c b/dlls/uiautomationcore/uia_com_client.c
index c2b723660b1..19540b19dc0 100644
--- a/dlls/uiautomationcore/uia_com_client.c
+++ b/dlls/uiautomationcore/uia_com_client.c
@@ -84,9 +84,9 @@ static ULONG WINAPI uia_or_condition_Release(IUIAutomationOrCondition *iface)
             }
         }
 
-        heap_free(uia_or_condition->child_ifaces);
-        heap_free(uia_or_condition->condition.ppConditions);
-        heap_free(uia_or_condition);
+        free(uia_or_condition->child_ifaces);
+        free(uia_or_condition->condition.ppConditions);
+        free(uia_or_condition);
     }
 
     return ref;
@@ -164,21 +164,21 @@ static HRESULT create_uia_or_condition_iface(IUIAutomationCondition **out_cond,
 
     *out_cond = NULL;
 
-    uia_or_condition = heap_alloc_zero(sizeof(*uia_or_condition));
+    uia_or_condition = calloc(1, sizeof(*uia_or_condition));
     if (!uia_or_condition)
         return E_OUTOFMEMORY;
 
     uia_or_condition->IUIAutomationOrCondition_iface.lpVtbl = &uia_or_condition_vtbl;
     uia_or_condition->ref = 1;
 
-    uia_or_condition->child_ifaces = heap_alloc_zero(sizeof(*in_conds) * in_cond_count);
+    uia_or_condition->child_ifaces = calloc(in_cond_count, sizeof(*in_conds));
     if (!uia_or_condition->child_ifaces)
     {
         IUIAutomationOrCondition_Release(&uia_or_condition->IUIAutomationOrCondition_iface);
         return E_OUTOFMEMORY;
     }
 
-    uia_or_condition->condition.ppConditions = heap_alloc_zero(sizeof(*uia_or_condition->condition.ppConditions) * in_cond_count);
+    uia_or_condition->condition.ppConditions = calloc(in_cond_count, sizeof(*uia_or_condition->condition.ppConditions));
     if (!uia_or_condition->condition.ppConditions)
     {
         IUIAutomationOrCondition_Release(&uia_or_condition->IUIAutomationOrCondition_iface);
@@ -253,7 +253,7 @@ static ULONG WINAPI uia_not_condition_Release(IUIAutomationNotCondition *iface)
     if (!ref)
     {
         IUIAutomationCondition_Release(uia_not_condition->child_iface);
-        heap_free(uia_not_condition);
+        free(uia_not_condition);
     }
 
     return ref;
@@ -295,7 +295,7 @@ static HRESULT create_uia_not_condition_iface(IUIAutomationCondition **out_cond,
     if (FAILED(hr))
         return hr;
 
-    uia_not_condition = heap_alloc_zero(sizeof(*uia_not_condition));
+    uia_not_condition = calloc(1, sizeof(*uia_not_condition));
     if (!uia_not_condition)
         return E_OUTOFMEMORY;
 
@@ -357,7 +357,7 @@ static ULONG WINAPI uia_property_condition_Release(IUIAutomationPropertyConditio
     if (!ref)
     {
         VariantClear(&uia_property_condition->condition.Value);
-        heap_free(uia_property_condition);
+        free(uia_property_condition);
     }
 
     return ref;
@@ -445,7 +445,7 @@ static HRESULT create_uia_property_condition_iface(IUIAutomationCondition **out_
         return E_NOTIMPL;
     }
 
-    uia_property_condition = heap_alloc_zero(sizeof(*uia_property_condition));
+    uia_property_condition = calloc(1, sizeof(*uia_property_condition));
     if (!uia_property_condition)
         return E_OUTOFMEMORY;
 
@@ -504,7 +504,7 @@ static ULONG WINAPI uia_bool_condition_Release(IUIAutomationBoolCondition *iface
 
     TRACE("%p, refcount %ld\n", uia_bool_condition, ref);
     if (!ref)
-        heap_free(uia_bool_condition);
+        free(uia_bool_condition);
 
     return ref;
 }
@@ -540,7 +540,7 @@ static HRESULT create_uia_bool_condition_iface(IUIAutomationCondition **out_cond
     if (!out_cond)
         return E_POINTER;
 
-    uia_bool_condition = heap_alloc_zero(sizeof(*uia_bool_condition));
+    uia_bool_condition = calloc(1, sizeof(*uia_bool_condition));
     if (!uia_bool_condition)
         return E_OUTOFMEMORY;
 
@@ -673,8 +673,8 @@ static ULONG WINAPI uia_cache_request_Release(IUIAutomationCacheRequest *iface)
     if (!ref)
     {
         IUIAutomationCondition_Release(uia_cache_request->view_condition);
-        heap_free(uia_cache_request->prop_ids);
-        heap_free(uia_cache_request);
+        free(uia_cache_request->prop_ids);
+        free(uia_cache_request);
     }
 
     return ref;
@@ -861,7 +861,7 @@ static HRESULT create_uia_cache_request_iface(IUIAutomationCacheRequest **out_ca
     if (FAILED(hr))
         return hr;
 
-    uia_cache_request = heap_alloc_zero(sizeof(*uia_cache_request));
+    uia_cache_request = calloc(1, sizeof(*uia_cache_request));
     if (!uia_cache_request)
     {
         IUIAutomationCondition_Release(view_condition);
@@ -975,7 +975,7 @@ static HRESULT uia_event_handlers_add_handler(IUnknown *handler_iface, SAFEARRAY
         event_map = RB_ENTRY_VALUE(rb_entry, struct uia_event_handler_map_entry, entry);
     else
     {
-        if (!(event_map = heap_alloc_zero(sizeof(*event_map))))
+        if (!(event_map = calloc(1, sizeof(*event_map))))
         {
             hr = E_OUTOFMEMORY;
             goto exit;
@@ -984,7 +984,7 @@ static HRESULT uia_event_handlers_add_handler(IUnknown *handler_iface, SAFEARRAY
         hr = SafeArrayCopy(runtime_id, &event_map->runtime_id);
         if (FAILED(hr))
         {
-            heap_free(event_map);
+            free(event_map);
             goto exit;
         }
 
@@ -1013,7 +1013,7 @@ static void uia_event_handler_destroy(struct uia_com_event *event)
         UiaRemoveEvent(event->event);
     if (event->git_cookie)
         unregister_interface_in_git(event->git_cookie);
-    heap_free(event);
+    free(event);
 }
 
 static void uia_event_handler_map_entry_destroy(struct uia_event_handler_map_entry *entry)
@@ -1029,7 +1029,7 @@ static void uia_event_handler_map_entry_destroy(struct uia_event_handler_map_ent
     rb_remove(&com_event_handlers.handler_map, &entry->entry);
     IUnknown_Release(entry->handler_iface);
     SafeArrayDestroy(entry->runtime_id);
-    heap_free(entry);
+    free(entry);
 }
 
 static void uia_event_handlers_remove_handlers(IUnknown *handler_iface, SAFEARRAY *runtime_id, int event_id)
@@ -1153,8 +1153,8 @@ static ULONG WINAPI uia_element_array_Release(IUIAutomationElementArray *iface)
                     IUIAutomationElement_Release(element_arr->elements[i]);
             }
         }
-        heap_free(element_arr->elements);
-        heap_free(element_arr);
+        free(element_arr->elements);
+        free(element_arr);
     }
 
     return ref;
@@ -1203,7 +1203,7 @@ static const IUIAutomationElementArrayVtbl uia_element_array_vtbl = {
 
 static HRESULT create_uia_element_array_iface(IUIAutomationElementArray **iface, int elements_count)
 {
-    struct uia_element_array *element_arr = heap_alloc_zero(sizeof(*element_arr));
+    struct uia_element_array *element_arr = calloc(1, sizeof(*element_arr));
 
     *iface = NULL;
     if (!element_arr)
@@ -1212,9 +1212,9 @@ static HRESULT create_uia_element_array_iface(IUIAutomationElementArray **iface,
     element_arr->IUIAutomationElementArray_iface.lpVtbl = &uia_element_array_vtbl;
     element_arr->ref = 1;
     element_arr->elements_count = elements_count;
-    if (!(element_arr->elements = heap_alloc_zero(sizeof(*element_arr->elements) * elements_count)))
+    if (!(element_arr->elements = calloc(elements_count, sizeof(*element_arr->elements))))
     {
-        heap_free(element_arr);
+        free(element_arr);
         return E_OUTOFMEMORY;
     }
 
@@ -1293,9 +1293,9 @@ static ULONG WINAPI uia_element_Release(IUIAutomationElement9 *iface)
         }
 
         IUnknown_Release(element->marshal);
-        heap_free(element->cached_props);
+        free(element->cached_props);
         UiaNodeRelease(element->node);
-        heap_free(element);
+        free(element);
     }
 
     return ref;
@@ -2539,7 +2539,7 @@ static const IUIAutomationElement9Vtbl uia_element_vtbl = {
 
 static HRESULT create_uia_element(IUIAutomationElement **iface, BOOL from_cui8, HUIANODE node)
 {
-    struct uia_element *element = heap_alloc_zero(sizeof(*element));
+    struct uia_element *element = calloc(1, sizeof(*element));
     HRESULT hr;
 
     *iface = NULL;
@@ -2554,7 +2554,7 @@ static HRESULT create_uia_element(IUIAutomationElement **iface, BOOL from_cui8,
     hr = CoCreateFreeThreadedMarshaler((IUnknown *)&element->IUIAutomationElement9_iface, &element->marshal);
     if (FAILED(hr))
     {
-        heap_free(element);
+        free(element);
         return hr;
     }
 
@@ -2603,7 +2603,7 @@ static HRESULT create_uia_element_from_cache_req(IUIAutomationElement **iface, B
     {
         LONG i;
 
-        elem_data->cached_props = heap_alloc_zero(sizeof(*elem_data->cached_props) * cache_req->cProperties);
+        elem_data->cached_props = calloc(cache_req->cProperties, sizeof(*elem_data->cached_props));
         if (!elem_data->cached_props)
         {
             hr = E_OUTOFMEMORY;
@@ -2702,7 +2702,7 @@ static ULONG WINAPI uia_tree_walker_Release(IUIAutomationTreeWalker *iface)
         if (tree_walker->default_cache_req)
             IUIAutomationCacheRequest_Release(tree_walker->default_cache_req);
         IUIAutomationCondition_Release(tree_walker->nav_cond);
-        heap_free(tree_walker);
+        free(tree_walker);
     }
 
     return ref;
@@ -2895,7 +2895,7 @@ static HRESULT create_uia_tree_walker(IUIAutomationTreeWalker **out_tree_walker,
     if (FAILED(hr))
         return hr;
 
-    tree_walker = heap_alloc_zero(sizeof(*tree_walker));
+    tree_walker = calloc(1, sizeof(*tree_walker));
     if (!tree_walker)
         return E_OUTOFMEMORY;
 
@@ -2968,7 +2968,7 @@ static ULONG WINAPI uia_iface_Release(IUIAutomation6 *iface)
 
     TRACE("%p, refcount %ld\n", uia_iface, ref);
     if (!ref)
-        heap_free(uia_iface);
+        free(uia_iface);
     return ref;
 }
 
@@ -3288,7 +3288,7 @@ static HRESULT uia_add_com_event_handler(IUIAutomation6 *iface, EVENTID event_id
     if (FAILED(hr))
         goto exit;
 
-    if (!(com_event = heap_alloc_zero(sizeof(*com_event))))
+    if (!(com_event = calloc(1, sizeof(*com_event))))
     {
         hr = E_OUTOFMEMORY;
         goto exit;
@@ -3925,7 +3925,7 @@ HRESULT create_uia_iface(IUnknown **iface, BOOL is_cui8)
 {
     struct uia_iface *uia;
 
-    uia = heap_alloc_zero(sizeof(*uia));
+    uia = calloc(1, sizeof(*uia));
     if (!uia)
         return E_OUTOFMEMORY;
 
diff --git a/dlls/uiautomationcore/uia_event.c b/dlls/uiautomationcore/uia_event.c
index 693b0b7509b..10dc1934844 100644
--- a/dlls/uiautomationcore/uia_event.c
+++ b/dlls/uiautomationcore/uia_event.c
@@ -139,7 +139,7 @@ static HRESULT uia_event_map_add_event(struct uia_event *event)
 
     if (!(event_entry = uia_get_event_map_entry_for_event(event->event_id)))
     {
-        if (!(event_entry = heap_alloc_zero(sizeof(*event_entry))))
+        if (!(event_entry = calloc(1, sizeof(*event_entry))))
         {
             LeaveCriticalSection(&event_map_cs);
             return E_OUTOFMEMORY;
@@ -207,7 +207,7 @@ static void uia_event_map_entry_release(struct uia_event_map_entry *entry)
             IWineUiaEvent_Release(&event->IWineUiaEvent_iface);
         }
 
-        heap_free(entry);
+        free(entry);
     }
 }
 
@@ -219,7 +219,7 @@ static void uia_event_map_entry_release(struct uia_event_map_entry *entry)
  */
 static struct uia_event_args *create_uia_event_args(const struct uia_event_info *event_info)
 {
-    struct uia_event_args *args = heap_alloc_zero(sizeof(*args));
+    struct uia_event_args *args = calloc(1, sizeof(*args));
 
     if (!args)
         return NULL;
@@ -234,7 +234,7 @@ static struct uia_event_args *create_uia_event_args(const struct uia_event_info
 static void uia_event_args_release(struct uia_event_args *args)
 {
     if (!InterlockedDecrement(&args->ref))
-        heap_free(args);
+        free(args);
 }
 
 /*
@@ -412,7 +412,7 @@ static void uia_event_thread_process_queue(struct list *event_queue)
 
         uia_event_args_release(event->args);
         IWineUiaEvent_Release(&event->event->IWineUiaEvent_iface);
-        heap_free(event);
+        free(event);
     }
 }
 
@@ -581,8 +581,8 @@ static ULONG WINAPI uia_event_Release(IWineUiaEvent *iface)
 
         for (i = 0; i < event->event_advisers_count; i++)
             IWineUiaEventAdviser_Release(event->event_advisers[i]);
-        heap_free(event->event_advisers);
-        heap_free(event);
+        free(event->event_advisers);
+        free(event);
     }
 
     return ref;
@@ -626,7 +626,7 @@ static HRESULT WINAPI uia_event_advise_events(IWineUiaEvent *iface, BOOL advise_
 
         for (i = 0; i < event->event_advisers_count; i++)
             IWineUiaEventAdviser_Release(event->event_advisers[i]);
-        heap_free(event->event_advisers);
+        free(event->event_advisers);
         event->event_advisers_count = event->event_advisers_arr_size = 0;
     }
 
@@ -671,12 +671,12 @@ static HRESULT WINAPI uia_event_raise_event(IWineUiaEvent *iface, VARIANT in_nod
 
     assert(event->event_type != EVENT_TYPE_SERVERSIDE);
 
-    if (!(queue_event = heap_alloc_zero(sizeof(*queue_event))))
+    if (!(queue_event = calloc(1, sizeof(*queue_event))))
         return E_OUTOFMEMORY;
 
     if (!(args = create_uia_event_args(uia_event_info_from_id(event->event_id))))
     {
-        heap_free(queue_event);
+        free(queue_event);
         return E_OUTOFMEMORY;
     }
 
@@ -712,7 +712,7 @@ static struct uia_event *unsafe_impl_from_IWineUiaEvent(IWineUiaEvent *iface)
 
 static HRESULT create_uia_event(struct uia_event **out_event, LONG event_cookie, int event_type)
 {
-    struct uia_event *event = heap_alloc_zero(sizeof(*event));
+    struct uia_event *event = calloc(1, sizeof(*event));
 
     *out_event = NULL;
     if (!event)
@@ -775,7 +775,7 @@ HRESULT create_serverside_uia_event(struct uia_event **out_event, LONG process_i
 
     if (!uia_start_event_thread())
     {
-        heap_free(event);
+        free(event);
         hr = E_FAIL;
         goto exit;
     }
@@ -856,7 +856,7 @@ static ULONG WINAPI uia_event_adviser_Release(IWineUiaEventAdviser *iface)
                 WARN("Failed to revoke advise events interface from GIT\n");
         }
         IRawElementProviderAdviseEvents_Release(adv_events->advise_events);
-        heap_free(adv_events);
+        free(adv_events);
     }
 
     return ref;
@@ -920,7 +920,7 @@ HRESULT uia_event_add_provider_event_adviser(IRawElementProviderAdviseEvents *ad
     if (FAILED(hr))
         return hr;
 
-    if (!(adv_events = heap_alloc_zero(sizeof(*adv_events))))
+    if (!(adv_events = calloc(1, sizeof(*adv_events))))
         return E_OUTOFMEMORY;
 
     if (prov_opts & ProviderOptions_UseComThreading)
@@ -929,7 +929,7 @@ HRESULT uia_event_add_provider_event_adviser(IRawElementProviderAdviseEvents *ad
                 &adv_events->git_cookie);
         if (FAILED(hr))
         {
-            heap_free(adv_events);
+            free(adv_events);
             return hr;
         }
     }
@@ -990,7 +990,7 @@ static ULONG WINAPI uia_serverside_event_adviser_Release(IWineUiaEventAdviser *i
     if (!ref)
     {
         IWineUiaEvent_Release(adv_events->event_iface);
-        heap_free(adv_events);
+        free(adv_events);
     }
     return ref;
 }
@@ -1057,7 +1057,7 @@ HRESULT uia_event_add_serverside_event_adviser(IWineUiaEvent *serverside_event,
         }
     }
 
-    if (!(adv_events = heap_alloc_zero(sizeof(*adv_events))))
+    if (!(adv_events = calloc(1, sizeof(*adv_events))))
         return E_OUTOFMEMORY;
 
     adv_events->IWineUiaEventAdviser_iface.lpVtbl = &uia_serverside_event_adviser_vtbl;
@@ -1280,14 +1280,14 @@ static HRESULT uia_event_invoke(HUIANODE node, HUIANODE nav_start_node, struct u
         struct uia_queue_event *queue_event;
         HUIANODE node2, nav_start_node2;
 
-        if (!(queue_event = heap_alloc_zero(sizeof(*queue_event))))
+        if (!(queue_event = calloc(1, sizeof(*queue_event))))
             return E_OUTOFMEMORY;
 
         node2 = nav_start_node2 = NULL;
         hr = clone_uia_node(node, &node2);
         if (FAILED(hr))
         {
-            heap_free(queue_event);
+            free(queue_event);
             return hr;
         }
 
@@ -1296,7 +1296,7 @@ static HRESULT uia_event_invoke(HUIANODE node, HUIANODE nav_start_node, struct u
             hr = clone_uia_node(nav_start_node, &nav_start_node2);
             if (FAILED(hr))
             {
-                heap_free(queue_event);
+                free(queue_event);
                 UiaNodeRelease(node2);
                 return hr;
             }
diff --git a/dlls/uiautomationcore/uia_main.c b/dlls/uiautomationcore/uia_main.c
index 0ae6b744591..9ca320b1ba0 100644
--- a/dlls/uiautomationcore/uia_main.c
+++ b/dlls/uiautomationcore/uia_main.c
@@ -68,7 +68,7 @@ static ULONG WINAPI uia_object_wrapper_Release(IUnknown *iface)
     if (!refcount)
     {
         IUnknown_Release(wrapper->marshaler);
-        heap_free(wrapper);
+        free(wrapper);
     }
 
     return refcount;
@@ -92,7 +92,7 @@ static HRESULT create_uia_object_wrapper(IUnknown *reserved, void **ppv)
 
     TRACE("%p, %p\n", reserved, ppv);
 
-    wrapper = heap_alloc(sizeof(*wrapper));
+    wrapper = calloc(1, sizeof(*wrapper));
     if (!wrapper)
         return E_OUTOFMEMORY;
 
@@ -102,7 +102,7 @@ static HRESULT create_uia_object_wrapper(IUnknown *reserved, void **ppv)
 
     if (FAILED(hr = CoCreateFreeThreadedMarshaler(&wrapper->IUnknown_iface, &wrapper->marshaler)))
     {
-        heap_free(wrapper);
+        free(wrapper);
         return hr;
     }
 
@@ -193,7 +193,7 @@ ULONG WINAPI hwnd_host_provider_Release(IRawElementProviderSimple *iface)
     TRACE("%p, refcount %ld\n", iface, refcount);
 
     if (!refcount)
-        heap_free(host_prov);
+        free(host_prov);
 
     return refcount;
 }
@@ -370,7 +370,7 @@ HRESULT WINAPI UiaHostProviderFromHwnd(HWND hwnd, IRawElementProviderSimple **pr
     if (!IsWindow(hwnd) || !provider)
         return E_INVALIDARG;
 
-    host_prov = heap_alloc(sizeof(*host_prov));
+    host_prov = calloc(1, sizeof(*host_prov));
     if (!host_prov)
         return E_OUTOFMEMORY;
 
@@ -446,7 +446,7 @@ static ULONG WINAPI uia_cf_Release(IClassFactory *iface)
     TRACE("%p, refcount %ld\n", cf, ref);
 
     if (!ref)
-        heap_free(cf);
+        free(cf);
 
     return ref;
 }
@@ -496,7 +496,7 @@ static const IClassFactoryVtbl uia_cf_Vtbl =
 
 static inline HRESULT create_uia_cf(REFCLSID clsid, REFIID riid, void **ppv)
 {
-    struct uia_cf *cf = heap_alloc_zero(sizeof(*cf));
+    struct uia_cf *cf = calloc(1, sizeof(*cf));
     HRESULT hr;
 
     *ppv = NULL;
diff --git a/dlls/uiautomationcore/uia_private.h b/dlls/uiautomationcore/uia_private.h
index bbd2074a7f3..253eacbc4e7 100644
--- a/dlls/uiautomationcore/uia_private.h
+++ b/dlls/uiautomationcore/uia_private.h
@@ -22,7 +22,6 @@
 #include "uia_classes.h"
 #include "wine/list.h"
 #include "wine/rbtree.h"
-#include "wine/heap.h"
 
 extern HMODULE huia_module DECLSPEC_HIDDEN;
 
@@ -187,10 +186,7 @@ static inline BOOL uia_array_reserve(void **elements, SIZE_T *capacity, SIZE_T c
     if (new_capacity < count)
         new_capacity = count;
 
-    if (!*elements)
-        new_elements = heap_alloc_zero(new_capacity * size);
-    else
-        new_elements = HeapReAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, *elements, new_capacity * size);
+    new_elements = _recalloc(*elements, new_capacity, size);
     if (!new_elements)
         return FALSE;
 
diff --git a/dlls/uiautomationcore/uia_provider.c b/dlls/uiautomationcore/uia_provider.c
index f13b028cad6..b16077b607c 100644
--- a/dlls/uiautomationcore/uia_provider.c
+++ b/dlls/uiautomationcore/uia_provider.c
@@ -342,7 +342,7 @@ static HRESULT msaa_acc_get_child_pos(IAccessible *acc, IAccessible **out_parent
         return hr;
     }
 
-    children = heap_alloc_zero(sizeof(*children) * child_count);
+    children = calloc(child_count, sizeof(*children));
     if (!children)
         return E_OUTOFMEMORY;
 
@@ -396,7 +396,7 @@ exit:
             IAccessible_Release(children[i]);
     }
 
-    heap_free(children);
+    free(children);
 
     return hr;
 }
@@ -572,7 +572,7 @@ ULONG WINAPI msaa_provider_Release(IRawElementProviderSimple *iface)
             IAccessible_Release(msaa_prov->parent);
         if (msaa_prov->ia2)
             IAccessible2_Release(msaa_prov->ia2);
-        heap_free(msaa_prov);
+        free(msaa_prov);
     }
 
     return refcount;
@@ -1136,7 +1136,7 @@ static const ILegacyIAccessibleProviderVtbl msaa_acc_provider_vtbl = {
 HRESULT create_msaa_provider(IAccessible *acc, LONG child_id, HWND hwnd, BOOL known_root_acc,
         IRawElementProviderSimple **elprov)
 {
-    struct msaa_provider *msaa_prov = heap_alloc_zero(sizeof(*msaa_prov));
+    struct msaa_provider *msaa_prov = calloc(1, sizeof(*msaa_prov));
 
     if (!msaa_prov)
         return E_OUTOFMEMORY;
@@ -1337,7 +1337,7 @@ static ULONG WINAPI base_hwnd_provider_Release(IRawElementProviderSimple *iface)
     TRACE("%p, refcount %ld\n", iface, refcount);
 
     if (!refcount)
-        heap_free(base_hwnd_prov);
+        free(base_hwnd_prov);
 
     return refcount;
 }
@@ -1629,7 +1629,7 @@ HRESULT create_base_hwnd_provider(HWND hwnd, IRawElementProviderSimple **elprov)
     if (!IsWindow(hwnd))
         return UIA_E_ELEMENTNOTAVAILABLE;
 
-    if (!(base_hwnd_prov = heap_alloc_zero(sizeof(*base_hwnd_prov))))
+    if (!(base_hwnd_prov = calloc(1, sizeof(*base_hwnd_prov))))
         return E_OUTOFMEMORY;
 
     base_hwnd_prov->IRawElementProviderSimple_iface.lpVtbl = &base_hwnd_provider_vtbl;
@@ -1695,7 +1695,7 @@ void uia_provider_thread_remove_node(HUIANODE node)
         {
             rb_remove(&provider_thread.node_map, &node_data->map->entry);
             SafeArrayDestroy(node_data->map->runtime_id);
-            heap_free(node_data->map);
+            free(node_data->map);
         }
         node_data->map = NULL;
     }
@@ -1736,7 +1736,7 @@ static void uia_provider_thread_disconnect_node(SAFEARRAY *sa)
 
         rb_remove(&provider_thread.node_map, &prov_map->entry);
         SafeArrayDestroy(prov_map->runtime_id);
-        heap_free(prov_map);
+        free(prov_map);
     }
 
 exit:
@@ -1768,7 +1768,7 @@ static HRESULT uia_provider_thread_add_node(HUIANODE node, SAFEARRAY *rt_id)
             prov_map = RB_ENTRY_VALUE(rb_entry, struct uia_provider_thread_map_entry, entry);
         else
         {
-            prov_map = heap_alloc_zero(sizeof(*prov_map));
+            prov_map = calloc(1, sizeof(*prov_map));
             if (!prov_map)
             {
                 hr = E_OUTOFMEMORY;
@@ -1778,7 +1778,7 @@ static HRESULT uia_provider_thread_add_node(HUIANODE node, SAFEARRAY *rt_id)
             hr = SafeArrayCopy(rt_id, &prov_map->runtime_id);
             if (FAILED(hr))
             {
-                heap_free(prov_map);
+                free(prov_map);
                 goto exit;
             }
             list_init(&prov_map->nodes_list);
diff --git a/dlls/uiautomationcore/uia_utils.c b/dlls/uiautomationcore/uia_utils.c
index 2b6f42fa520..9f27d6a0b34 100644
--- a/dlls/uiautomationcore/uia_utils.c
+++ b/dlls/uiautomationcore/uia_utils.c
@@ -149,7 +149,7 @@ static void uia_condition_destroy(struct UiaCondition *cond)
 
         for (i = 0; i < and_or_cond->cConditions; i++)
             uia_condition_destroy(and_or_cond->ppConditions[i]);
-        heap_free(and_or_cond->ppConditions);
+        free(and_or_cond->ppConditions);
         break;
     }
 
@@ -157,7 +157,7 @@ static void uia_condition_destroy(struct UiaCondition *cond)
         break;
     }
 
-    heap_free(cond);
+    free(cond);
 }
 
 static HRESULT uia_condition_clone(struct UiaCondition **dst, struct UiaCondition *src)
@@ -169,7 +169,7 @@ static HRESULT uia_condition_clone(struct UiaCondition **dst, struct UiaConditio
     {
     case ConditionType_True:
     case ConditionType_False:
-        if (!(*dst = heap_alloc_zero(sizeof(**dst))))
+        if (!(*dst = calloc(1, sizeof(**dst))))
             return E_OUTOFMEMORY;
 
         (*dst)->ConditionType = src->ConditionType;
@@ -177,7 +177,7 @@ static HRESULT uia_condition_clone(struct UiaCondition **dst, struct UiaConditio
 
     case ConditionType_Property:
     {
-        struct UiaPropertyCondition *prop_cond = heap_alloc_zero(sizeof(*prop_cond));
+        struct UiaPropertyCondition *prop_cond = calloc(1, sizeof(*prop_cond));
         struct UiaPropertyCondition *src_cond = (struct UiaPropertyCondition *)src;
 
         if (!prop_cond)
@@ -194,7 +194,7 @@ static HRESULT uia_condition_clone(struct UiaCondition **dst, struct UiaConditio
 
     case ConditionType_Not:
     {
-        struct UiaNotCondition *not_cond = heap_alloc_zero(sizeof(*not_cond));
+        struct UiaNotCondition *not_cond = calloc(1, sizeof(*not_cond));
         struct UiaNotCondition *src_cond = (struct UiaNotCondition *)src;
 
         if (!not_cond)
@@ -209,7 +209,7 @@ static HRESULT uia_condition_clone(struct UiaCondition **dst, struct UiaConditio
     case ConditionType_And:
     case ConditionType_Or:
     {
-        struct UiaAndOrCondition *and_or_cond = heap_alloc_zero(sizeof(*and_or_cond));
+        struct UiaAndOrCondition *and_or_cond = calloc(1, sizeof(*and_or_cond));
         struct UiaAndOrCondition *src_cond = (struct UiaAndOrCondition *)src;
         int i;
 
@@ -218,7 +218,7 @@ static HRESULT uia_condition_clone(struct UiaCondition **dst, struct UiaConditio
 
         *dst = (struct UiaCondition *)and_or_cond;
         and_or_cond->ConditionType = src_cond->ConditionType;
-        and_or_cond->ppConditions = heap_alloc_zero(sizeof(*and_or_cond->ppConditions) * src_cond->cConditions);
+        and_or_cond->ppConditions = calloc(src_cond->cConditions, sizeof(*and_or_cond->ppConditions));
         if (!and_or_cond->ppConditions)
         {
             hr = E_OUTOFMEMORY;
@@ -257,8 +257,8 @@ exit:
 void uia_cache_request_destroy(struct UiaCacheRequest *cache_req)
 {
     uia_condition_destroy(cache_req->pViewCondition);
-    heap_free(cache_req->pProperties);
-    heap_free(cache_req->pPatterns);
+    free(cache_req->pProperties);
+    free(cache_req->pPatterns);
 }
 
 HRESULT uia_cache_request_clone(struct UiaCacheRequest *dst, struct UiaCacheRequest *src)
@@ -273,7 +273,7 @@ HRESULT uia_cache_request_clone(struct UiaCacheRequest *dst, struct UiaCacheRequ
     dst->automationElementMode = src->automationElementMode;
     if (src->cProperties)
     {
-        if (!(dst->pProperties = heap_alloc_zero(sizeof(*dst->pProperties) * src->cProperties)))
+        if (!(dst->pProperties = calloc(src->cProperties, sizeof(*dst->pProperties))))
         {
             uia_cache_request_destroy(dst);
             return E_OUTOFMEMORY;
@@ -285,7 +285,7 @@ HRESULT uia_cache_request_clone(struct UiaCacheRequest *dst, struct UiaCacheRequ
 
     if (src->cPatterns)
     {
-        if (!(dst->pPatterns = heap_alloc_zero(sizeof(*dst->pPatterns) * src->cPatterns)))
+        if (!(dst->pPatterns = calloc(src->cPatterns, sizeof(*dst->pPatterns))))
         {
             uia_cache_request_destroy(dst);
             return E_OUTOFMEMORY;