diff --git a/dlls/user/user32.spec b/dlls/user/user32.spec
index 450d0573ba9..e3737124048 100644
--- a/dlls/user/user32.spec
+++ b/dlls/user/user32.spec
@@ -717,7 +717,7 @@
 @ stdcall UnregisterHotKey(long long)
 # @ stub UnregisterMessagePumpHook
 # @ stub UnregisterUserApiHook
-# @ stub UpdateLayeredWindow
+@ stdcall UpdateLayeredWindow(long long ptr ptr long ptr long ptr long)
 @ stub UpdatePerUserSystemParameters
 @ stdcall UpdateWindow(long)
 @ stdcall User32InitializeImmEntryTable(ptr)
diff --git a/dlls/user/win.c b/dlls/user/win.c
index 4dd37eb931f..2f26cd750bc 100644
--- a/dlls/user/win.c
+++ b/dlls/user/win.c
@@ -3077,3 +3077,15 @@ BOOL WINAPI SetLayeredWindowAttributes( HWND hWnd, COLORREF rgbKey,
     FIXME("(%p,0x%.8lx,%d,%ld): stub!\n", hWnd, rgbKey, bAlpha, dwFlags);
     return TRUE;
 }
+
+/*****************************************************************************
+ *              UpdateLayeredWindow (USER32.@)
+ */
+BOOL WINAPI UpdateLayeredWindow( HWND hwnd, HDC hdcDst, POINT *pptDst, SIZE *psize,
+                                 HDC hdcSrc, POINT *pptSrc, COLORREF crKey, BLENDFUNCTION *pblend,
+                                 DWORD dwFlags)
+{
+    FIXME("(%p,%p,%p,%p,%p,%p,0x%08lx,%p,%ld): stub!\n",
+          hwnd, hdcDst, pptDst, psize, hdcSrc, pptSrc, crKey, pblend, dwFlags);
+    return 0;
+}