diff --git a/trytond/osv/orm.py b/trytond/osv/orm.py
index 7beffd3690..e7e4c7bab1 100644
--- a/trytond/osv/orm.py
+++ b/trytond/osv/orm.py
@@ -12,6 +12,7 @@ from lxml import etree
 import copy
 from trytond.sql_db import table_handler
 from decimal import Decimal
+import logging
 
 OPERATORS = (
         'child_of',