diff --git a/product.py b/product.py
index 2ef1a28518..ae14ad50ae 100644
--- a/product.py
+++ b/product.py
@@ -3,8 +3,6 @@
 import copy
 import logging
 
-from sql import Column
-
 from trytond.model import ModelView, ModelSQL, Model, fields
 from trytond.pyson import Eval
 from trytond.transaction import Transaction