diff --git a/Tools/idle/GrepDialog.py b/Tools/idle/GrepDialog.py
index df3504b9867..26f1236b22a 100644
--- a/Tools/idle/GrepDialog.py
+++ b/Tools/idle/GrepDialog.py
@@ -2,6 +2,7 @@ import string
 import os
 import re
 import fnmatch
+import sys
 from Tkinter import *
 import tkMessageBox
 import SearchEngine