diff --git a/offlineimap/imaplibutil.py b/offlineimap/imaplibutil.py
index 47328bf..30aed9a 100644
--- a/offlineimap/imaplibutil.py
+++ b/offlineimap/imaplibutil.py
@@ -22,6 +22,7 @@ from sys import exc_info
 import threading
 from hashlib import sha1
 import socket
+import errno
 
 from offlineimap.ui import getglobalui
 from offlineimap import OfflineImapError