diff --git a/dlls/schedsvc/schedsvc_private.h b/dlls/schedsvc/schedsvc_private.h
index 3abce07dcd6..b426078f3c2 100644
--- a/dlls/schedsvc/schedsvc_private.h
+++ b/dlls/schedsvc/schedsvc_private.h
@@ -23,26 +23,24 @@
 
 void schedsvc_auto_start(void) DECLSPEC_HIDDEN;
 
-static inline void* __WINE_ALLOC_SIZE(1) heap_alloc(SIZE_T size)
+static inline void* __WINE_ALLOC_SIZE(1) heap_alloc(size_t size)
 {
-    return MIDL_user_allocate(size);
+    return HeapAlloc(GetProcessHeap(), 0, size);
 }
 
-static inline void* __WINE_ALLOC_SIZE(1) heap_alloc_zero(SIZE_T size)
+static inline void* __WINE_ALLOC_SIZE(1) heap_alloc_zero(size_t size)
 {
-    void *ptr = MIDL_user_allocate(size);
-    if (ptr) memset(ptr, 0, size);
-    return ptr;
+    return HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, size);
 }
 
-static inline void* __WINE_ALLOC_SIZE(2) heap_realloc(void *ptr, SIZE_T size)
+static inline void* __WINE_ALLOC_SIZE(2) heap_realloc(void *mem, size_t size)
 {
-    return HeapReAlloc(GetProcessHeap(), 0, ptr, size);
+    return HeapReAlloc(GetProcessHeap(), 0, mem, size);
 }
 
-static inline void heap_free(void *ptr)
+static inline BOOL heap_free(void *mem)
 {
-    MIDL_user_free(ptr);
+    return HeapFree(GetProcessHeap(), 0, mem);
 }
 
 static inline WCHAR *heap_strdupW(const WCHAR *src)
diff --git a/dlls/schedsvc/svc_main.c b/dlls/schedsvc/svc_main.c
index 45496c93e12..bd8a29dcd95 100644
--- a/dlls/schedsvc/svc_main.c
+++ b/dlls/schedsvc/svc_main.c
@@ -27,6 +27,8 @@
 #include "schrpc.h"
 #include "wine/debug.h"
 
+#include "schedsvc_private.h"
+
 WINE_DEFAULT_DEBUG_CHANNEL(schedsvc);
 
 static const WCHAR scheduleW[] = {'S','c','h','e','d','u','l','e',0};
@@ -200,10 +202,10 @@ void WINAPI ServiceMain(DWORD argc, LPWSTR *argv)
 
 void  __RPC_FAR * __RPC_USER MIDL_user_allocate(SIZE_T len)
 {
-    return HeapAlloc(GetProcessHeap(), 0, len);
+    return heap_alloc(len);
 }
 
 void __RPC_USER MIDL_user_free(void __RPC_FAR * ptr)
 {
-    HeapFree(GetProcessHeap(), 0, ptr);
+    heap_free(ptr);
 }