diff --git a/addons/website_sale/controllers/main.py b/addons/website_sale/controllers/main.py
index 2dadc53573e..aeadf2a4f3c 100644
--- a/addons/website_sale/controllers/main.py
+++ b/addons/website_sale/controllers/main.py
@@ -145,7 +145,8 @@ class website_sale(http.Controller):
 
     def _get_search_order(self, post):
         # OrderBy will be parsed in orm and so no direct sql injection
-        return 'website_published desc,%s' % post.get('order', 'website_sequence desc')
+        # id is added to be sure that order is a unique sort key
+        return 'website_published desc,%s , id desc' % post.get('order', 'website_sequence desc')
 
     def _get_search_domain(self, search, category, attrib_values):
         domain = request.website.sale_product_domain()