diff --git a/bin/service/web_services.py b/bin/service/web_services.py
index dfcf7272d63..8d0202667ff 100644
--- a/bin/service/web_services.py
+++ b/bin/service/web_services.py
@@ -28,6 +28,7 @@ import string
 import thread
 import threading
 import time
+import sys
 
 from tools.translate import _
 import addons