diff --git a/models/__init__.py b/models/__init__.py
index 1cc49f34af5..146839e75cc 100644
--- a/models/__init__.py
+++ b/models/__init__.py
@@ -3,4 +3,3 @@
 
 import sale_coupon_rule
 import sale_order
-import website
diff --git a/models/sale_order.py b/models/sale_order.py
index 3effee6a17c..a009b938c3d 100644
--- a/models/sale_order.py
+++ b/models/sale_order.py
@@ -17,3 +17,9 @@ class SaleOrder(models.Model):
         if error and delete:
             request.session.pop('error_promo_code')
         return error
+
+    @api.multi
+    def _cart_update(self, product_id=None, line_id=None, add_qty=0, set_qty=0, attributes=None, **kwargs):
+        res = super(SaleOrder, self)._cart_update(product_id=product_id, line_id=line_id, add_qty=add_qty, set_qty=set_qty, attributes=attributes, **kwargs)
+        self.recompute_coupon_lines()
+        return res
diff --git a/models/website.py b/models/website.py
deleted file mode 100644
index 37f93c7f64b..00000000000
--- a/models/website.py
+++ /dev/null
@@ -1,12 +0,0 @@
-# -*- coding: utf-8 -*-
-from odoo import models, fields, api
-
-
-class Website(models.Model):
-    _inherit = "website"
-
-    @api.multi
-    def sale_get_order(self, force_create=False, code=None, update_pricelist=False, force_pricelist=False):
-        order = super(Website, self).sale_get_order(force_create, code, update_pricelist, force_pricelist)
-        order.recompute_coupon_lines()
-        return order