diff --git a/monkeysign/ui.py b/monkeysign/ui.py
index 41f68fba4ec5717160e2646229d37c7983df6e60..d51b319c45d93645675be643ca977d8808cc300c 100644
--- a/monkeysign/ui.py
+++ b/monkeysign/ui.py
@@ -37,6 +37,7 @@ import sys
 import re
 import os
 import shutil
+import socket
 
 class MonkeysignUi(object):
     """User interface abstraction for monkeysign.