diff --git a/addons/event/report/report_event_registration.py b/addons/event/report/report_event_registration.py
index 7fbcfa8bcf4..e3fc7bdc803 100644
--- a/addons/event/report/report_event_registration.py
+++ b/addons/event/report/report_event_registration.py
@@ -82,18 +82,12 @@ class report_event_registration(osv.osv):
             GROUP BY
                 event_id,
                 user_id_registration,
-                e.id,
                 r.id,
                 registration_state,
                 r.nb_register,
                 event_type,
                 e.id,
                 e.date_begin,
-                e.main_speaker_id,
-                e.register_max,
-                event_id,
-                e.user_id,
-                e.company_id,
                 e.user_id,
                 event_state,
                 e.company_id,