diff --git a/lib/core/common.py b/lib/core/common.py
index 3fd6b1525..ff29d62d5 100644
--- a/lib/core/common.py
+++ b/lib/core/common.py
@@ -26,6 +26,7 @@ import sys
 import tempfile
 import time
 import types
+import urllib
 import urlparse
 import unicodedata