diff --git a/src/msw/window.cpp b/src/msw/window.cpp
index 00c1843de6..5c7c133f83 100644
--- a/src/msw/window.cpp
+++ b/src/msw/window.cpp
@@ -1721,7 +1721,7 @@ long wxWindow::MSWOnNotify(WXWPARAM wParam, WXLPARAM lParam)
 #endif  // Win95
 
     // not processed
-    return FALSE;
+    return Default();
 }
 
 void wxWindow::MSWOnMenuHighlight(WXWORD WXUNUSED(item), WXWORD WXUNUSED(flags), WXHMENU WXUNUSED(sysmenu))