diff --git a/addons/sale_stock/sale_stock.py b/addons/sale_stock/sale_stock.py
index 94ecec9efe3..9e409f8be31 100644
--- a/addons/sale_stock/sale_stock.py
+++ b/addons/sale_stock/sale_stock.py
@@ -284,7 +284,7 @@ class sale_order_line(osv.osv):
         product_uom_obj = self.pool.get('product.uom')
         product_obj = self.pool.get('product.product')
         warning = {}
-        res = super(sale_order_line, self).product_id_change(cr, uid, ids, pricelist, product, qty=qty,
+        res = self.product_id_change(cr, uid, ids, pricelist, product, qty=qty,
             uom=uom, qty_uos=qty_uos, uos=uos, name=name, partner_id=partner_id,
             lang=lang, update_tax=update_tax, date_order=date_order, packaging=packaging, fiscal_position=fiscal_position, flag=flag, context=context)