diff --git a/Lib/idlelib/macosx.py b/Lib/idlelib/macosx.py
index a2260af6e753a3..d3ae224100cff8 100644
--- a/Lib/idlelib/macosx.py
+++ b/Lib/idlelib/macosx.py
@@ -158,8 +158,8 @@ def postwindowsmenu(menu=menu):
 
         if end > 0:
             menu.delete(0, end)
-        windows.add_windows_to_menu(menu)
-    windows.register_callback(postwindowsmenu)
+        window.add_windows_to_menu(menu)
+    window.register_callback(postwindowsmenu)
 
     def about_dialog(event=None):
         "Handle Help 'About IDLE' event."