diff --git a/dlls/acledit/acledit.spec b/dlls/acledit/acledit.spec
index e33cc596a54..e1a30a1c708 100644
--- a/dlls/acledit/acledit.spec
+++ b/dlls/acledit/acledit.spec
@@ -2,7 +2,7 @@
 2 stub EditOwnerInfo
 3 stub EditPermissionInfo
 4 stdcall DllMain(long long ptr)
-5 stub FMExtensionProcW
+5 stdcall FMExtensionProcW(long long long)
 6 stub SedDiscretionaryAclEditor
 7 stub SedSystemAclEditor
 8 stub SedTakeOwnership
diff --git a/dlls/acledit/main.c b/dlls/acledit/main.c
index 7dd374c3fde..ec6166b1882 100644
--- a/dlls/acledit/main.c
+++ b/dlls/acledit/main.c
@@ -46,3 +46,15 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
     }
     return TRUE;
 }
+
+/***********************************************************************
+ *  FMExtensionProcW (acledit.@)
+ *
+ */
+
+LONG WINAPI FMExtensionProcW(HWND hWnd, WORD wEvent, LONG lParam)
+{
+    FIXME("%p, %d, 0x%x) stub\n", hWnd, wEvent, lParam);
+    return 0;
+
+}