diff --git a/Lib/idlelib/run.py b/Lib/idlelib/run.py
index 595e7bc3aa1..28ce4200a92 100644
--- a/Lib/idlelib/run.py
+++ b/Lib/idlelib/run.py
@@ -19,6 +19,12 @@
 
 import __main__
 
+for mod in ('simpledialog', 'messagebox', 'font',
+            'dialog', 'filedialog', 'commondialog',
+            'colorchooser'):
+    delattr(tkinter, mod)
+    del sys.modules['tkinter.' + mod]
+
 LOCALHOST = '127.0.0.1'
 
 import warnings