diff --git a/Lib/idlelib/IOBinding.py b/Lib/idlelib/IOBinding.py
--- a/Lib/idlelib/IOBinding.py
+++ b/Lib/idlelib/IOBinding.py
@@ -350,6 +350,16 @@
         self.updaterecentfileslist(filename)
         return "break"
 
+    if macosxSupport.runningAsOSXApp():
+        _save_as = save_as
+        def save_as(self, event):
+            if not getattr(self, '_saving', False):
+                self._saving = True
+                try:
+                    self._save_as(event)
+                finally:
+                    self._saving = False
+
     def save_a_copy(self, event):
         filename = self.asksavefile()
         if filename: