diff --git a/addons/project/controllers/rating.py b/addons/project/controllers/rating.py
index 3343674c0e8..4e800fbafb3 100644
--- a/addons/project/controllers/rating.py
+++ b/addons/project/controllers/rating.py
@@ -39,7 +39,7 @@ class RatingProject(http.Controller):
                     AND rating IN (1,5,10)
             GROUP BY
                 rated_partner_id, rating, period
-        """ % (project_id))
+        """, (project_id, ))
 
         raw_data = request.env.cr.dictfetchall()