diff --git a/Lib/idlelib/configDialog.py b/Lib/idlelib/configDialog.py
index f9092e1df8cf..3aa66721005e 100644
--- a/Lib/idlelib/configDialog.py
+++ b/Lib/idlelib/configDialog.py
@@ -1423,4 +1423,4 @@ def _configure_canvas(event):
     unittest.main('idlelib.idle_test.test_configdialog',
                   verbosity=2, exit=False)
     from idlelib.idle_test.htest import run
-    run(ConfigDialog, ConfigExtensionsDialog)
+    run(ConfigDialog)