diff --git a/Lib/idlelib/config.py b/Lib/idlelib/config.py
index 92992fd9cce9cd..81cf51863c2ff6 100644
--- a/Lib/idlelib/config.py
+++ b/Lib/idlelib/config.py
@@ -31,6 +31,7 @@
 
 from tkinter.font import Font
 import idlelib
+from idlelib import macosx
 
 class InvalidConfigType(Exception): pass
 class InvalidConfigSet(Exception): pass
@@ -660,6 +661,9 @@ def GetCoreKeys(self, keySetName=None):
             '<<zoom-height>>': ['<Alt-Key-2>'],
             }
 
+        if macosx.isAquaTk():
+            del keyBindings['<<close-all-windows>>']
+
         if keySetName:
             if not (self.userCfg['keys'].has_section(keySetName) or
                     self.defaultCfg['keys'].has_section(keySetName)):