diff --git a/proteus/__init__.py b/proteus/__init__.py
index 6a72e058f7..2010d21805 100644
--- a/proteus/__init__.py
+++ b/proteus/__init__.py
@@ -3,7 +3,6 @@
 '''
 A library to access Tryton's models like a client.
 '''
-import sys
 import threading
 import datetime
 import functools