diff --git a/sale.py b/sale.py
index aa23dbcbe2..493221c31b 100644
--- a/sale.py
+++ b/sale.py
@@ -5,7 +5,6 @@ from decimal import Decimal
 import datetime
 from itertools import groupby
 from functools import partial
-from operator import itemgetter
 from trytond.model import ModelWorkflow, ModelView, ModelSQL, fields
 from trytond.modules.company import CompanyReport
 from trytond.wizard import Wizard