diff --git a/dlls/mshtml/mshtml_private.h b/dlls/mshtml/mshtml_private.h
index d551693363a..ddc8df53655 100644
--- a/dlls/mshtml/mshtml_private.h
+++ b/dlls/mshtml/mshtml_private.h
@@ -928,6 +928,7 @@ void init_nsio(nsIComponentManager*) DECLSPEC_HIDDEN;
 void release_nsio(void) DECLSPEC_HIDDEN;
 BOOL is_gecko_path(const char*) DECLSPEC_HIDDEN;
 void set_viewer_zoom(NSContainer*,float) DECLSPEC_HIDDEN;
+float get_viewer_zoom(NSContainer*) DECLSPEC_HIDDEN;
 
 void init_node_cc(void) DECLSPEC_HIDDEN;
 
diff --git a/dlls/mshtml/nsembed.c b/dlls/mshtml/nsembed.c
index 6aae9c2948f..9acb0d29e8c 100644
--- a/dlls/mshtml/nsembed.c
+++ b/dlls/mshtml/nsembed.c
@@ -1191,6 +1191,29 @@ void set_viewer_zoom(NSContainer *nscontainer, float factor)
     nsIContentViewer_Release(content_viewer);
 }
 
+float get_viewer_zoom(NSContainer *nscontainer)
+{
+    nsIContentViewer *content_viewer;
+    nsIDocShell *doc_shell;
+    nsresult nsres;
+    float factor;
+
+    nsres = get_nsinterface((nsISupports*)nscontainer->navigation, &IID_nsIDocShell, (void**)&doc_shell);
+    assert(nsres == NS_OK);
+
+    nsres = nsIDocShell_GetContentViewer(doc_shell, &content_viewer);
+    assert(nsres == NS_OK && content_viewer);
+    nsIDocShell_Release(doc_shell);
+
+    nsres = nsIContentViewer_GetFullZoom(content_viewer, &factor);
+    if(NS_FAILED(nsres))
+        ERR("GetFullZoom failed: %08x\n", nsres);
+    TRACE("Got %f\n", factor);
+
+    nsIContentViewer_Release(content_viewer);
+    return factor;
+}
+
 struct nsWeakReference {
     nsIWeakReference nsIWeakReference_iface;
 
diff --git a/dlls/mshtml/olecmd.c b/dlls/mshtml/olecmd.c
index e5fc474bbe2..2baf715d2aa 100644
--- a/dlls/mshtml/olecmd.c
+++ b/dlls/mshtml/olecmd.c
@@ -558,12 +558,17 @@ static HRESULT exec_optical_zoom(HTMLDocument *This, DWORD nCmdexecopt, VARIANT
 {
     TRACE("(%p)->(%d %s %p)\n", This, nCmdexecopt, debugstr_variant(pvaIn), pvaOut);
 
-    if(!pvaIn || V_VT(pvaIn) != VT_I4) {
+    if(pvaIn && V_VT(pvaIn) != VT_I4) {
         FIXME("Unsupported argument %s\n", debugstr_variant(pvaIn));
         return E_NOTIMPL;
     }
 
-    set_viewer_zoom(This->doc_obj->nscontainer, (float)V_I4(pvaIn)/100);
+    if(pvaIn)
+        set_viewer_zoom(This->doc_obj->nscontainer, (float)V_I4(pvaIn)/100);
+    if(pvaOut) {
+        V_VT(pvaOut) = VT_I4;
+        V_I4(pvaOut) = get_viewer_zoom(This->doc_obj->nscontainer)*100;
+    }
     return S_OK;
 }
 
diff --git a/dlls/mshtml/tests/htmldoc.c b/dlls/mshtml/tests/htmldoc.c
index 3729fc30322..25cdf802b10 100644
--- a/dlls/mshtml/tests/htmldoc.c
+++ b/dlls/mshtml/tests/htmldoc.c
@@ -6702,7 +6702,7 @@ static void test_exec_noargs(IUnknown *unk, DWORD cmdid)
 static void test_exec_optical_zoom(IHTMLDocument2 *doc, int factor)
 {
     IOleCommandTarget *cmdtrg;
-    VARIANT v;
+    VARIANT v, out;
     HRESULT hres;
 
     hres = IHTMLDocument2_QueryInterface(doc, &IID_IOleCommandTarget, (void**)&cmdtrg);
@@ -6715,10 +6715,23 @@ static void test_exec_optical_zoom(IHTMLDocument2 *doc, int factor)
 
     SET_EXPECT(GetOverrideKeyPath);
     hres = IOleCommandTarget_Exec(cmdtrg, NULL, OLECMDID_OPTICAL_ZOOM,
-            OLECMDEXECOPT_DODEFAULT, &v, NULL);
+            OLECMDEXECOPT_DODEFAULT, &v, &out);
     ok(hres == S_OK || broken(hres == OLECMDERR_E_NOTSUPPORTED) /* IE6 */, "Exec failed: %08x\n", hres);
     CLEAR_CALLED(GetOverrideKeyPath);
 
+    if(hres != OLECMDERR_E_NOTSUPPORTED) {
+        ok(V_VT(&out) == VT_I4, "V_VT(&out) = %d\n", V_VT(&out));
+        ok(V_I4(&out) == factor, "V_I4(&out) = %d, expected %d\n", V_I4(&out), factor);
+
+        SET_EXPECT(GetOverrideKeyPath);
+        hres = IOleCommandTarget_Exec(cmdtrg, NULL, OLECMDID_OPTICAL_ZOOM,
+                OLECMDEXECOPT_DODEFAULT, NULL, &out);
+        ok(hres == S_OK, "Exec failed: %08x\n", hres);
+        ok(V_VT(&out) == VT_I4, "V_VT(&out) = %d\n", V_VT(&out));
+        ok(V_I4(&out) == factor, "V_I4(&out) = %d, expected %d\n", V_I4(&out), factor);
+        CLEAR_CALLED(GetOverrideKeyPath);
+    }
+
     IOleCommandTarget_Release(cmdtrg);
 
     test_QueryStatus((IUnknown*)doc, NULL, OLECMDID_OPTICAL_ZOOM, 0);