diff --git a/addons/web/common/session.py b/addons/web/common/session.py
index 125fc39488d..5906ee6314e 100644
--- a/addons/web/common/session.py
+++ b/addons/web/common/session.py
@@ -4,6 +4,8 @@ import babel
 import dateutil.relativedelta
 import logging
 import time
+import sys
+
 import openerplib
 
 from . import nonliterals