diff --git a/reactos/lib/comctl32/datetime.c b/reactos/lib/comctl32/datetime.c
index 8b8af308a8d..daa068591b0 100644
--- a/reactos/lib/comctl32/datetime.c
+++ b/reactos/lib/comctl32/datetime.c
@@ -1085,6 +1085,7 @@ DATETIME_WindowProc (HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 		     uMsg, wParam, lParam);
 	return DefWindowProcW (hwnd, uMsg, wParam, lParam);
     }
+    return 0;
 }