diff --git a/trytond/osv/osv.py b/trytond/osv/osv.py
index 5a6d0e309e..d9bf969cb7 100644
--- a/trytond/osv/osv.py
+++ b/trytond/osv/osv.py
@@ -2,7 +2,7 @@
 #this repository contains the full copyright notices and license terms.
 "Objects Services"
 
-from orm import ORM
+from orm import ORM, OPERATORS
 from trytond.netsvc import Service, LocalService
 from trytond import pooler
 import copy