diff --git a/reactos/include/psdk/ntgdi.h b/reactos/include/psdk/ntgdi.h
index 0692017e5e2..1bc5d42f524 100644
--- a/reactos/include/psdk/ntgdi.h
+++ b/reactos/include/psdk/ntgdi.h
@@ -698,7 +698,7 @@ NtGdiDdSetOverlayPosition(
 );
 
 W32KAPI
-VOID
+DWORD
 APIENTRY
 NtGdiDdUnattachSurface(
     IN HANDLE hSurface,