diff --git a/addons/event/report/report_event_registration.py b/addons/event/report/report_event_registration.py
index 17472e0cc95..59515f87a00 100644
--- a/addons/event/report/report_event_registration.py
+++ b/addons/event/report/report_event_registration.py
@@ -80,6 +80,7 @@ class report_event_registration(osv.osv):
 
                 LEFT JOIN
                     event_registration r ON (e.id=r.event_id)
+                    where r.id is not null
 
                GROUP BY
                 event_id,