#4406 Directory has to inherit from commondialog.Dialog
diff --git a/Lib/tkinter/filedialog.py b/Lib/tkinter/filedialog.py
index 599c8f2..98d2d5c 100644
--- a/Lib/tkinter/filedialog.py
+++ b/Lib/tkinter/filedialog.py
@@ -350,7 +350,7 @@
 
 
 # the directory dialog has its own _fix routines.
-class Directory(Dialog):
+class Directory(commondialog.Dialog):
     "Ask for a directory"
 
     command = "tk_chooseDirectory"