diff --git a/addons/website_sale/controllers/main.py b/addons/website_sale/controllers/main.py
index 78ae0beb7a2..18be643af72 100644
--- a/addons/website_sale/controllers/main.py
+++ b/addons/website_sale/controllers/main.py
@@ -383,6 +383,8 @@ class Ecommerce(http.Controller):
     def add_cart(self, product_id, remove=None, **kw):
         request.registry['website']._ecommerce_add_product_to_cart(request.cr, request.uid,
             product_id=int(product_id),
+            number=kw.get('number',1), 
+            set_number=kw.get('set_number',-1),
             context=request.context)
         return request.redirect("/shop/mycart/")