diff --git a/addons/stock/stock.py b/addons/stock/stock.py
index 4b372b78459..c6f9f07eb26 100644
--- a/addons/stock/stock.py
+++ b/addons/stock/stock.py
@@ -1010,7 +1010,7 @@ class stock_move(osv.osv):
             }
         return {'warning':warning}
 
-    def onchange_product_id(self, cr, uid, context, prod_id=False, loc_id=False, loc_dest_id=False):
+    def onchange_product_id(self, cr, uid, ids, prod_id=False, loc_id=False, loc_dest_id=False, context=None):
         if not prod_id:
             return {}
         product = self.pool.get('product.product').browse(cr, uid, [prod_id])[0]