diff --git a/product.py b/product.py
index b54ddbb..b52518a 100644
--- a/product.py
+++ b/product.py
@@ -1,7 +1,6 @@
 # This file is part of product_special_price module for Tryton.
 # The COPYRIGHT file at the top level of this repository contains the full
 # copyright notices and license terms.
-from trytond import backend
 from trytond.pool import Pool, PoolMeta
 from trytond.model import ModelSQL, fields
 from trytond.pyson import Eval