diff --git a/modules/monitoring/library/Monitoring/Backend/Ido/Query/NotificationhistoryQuery.php b/modules/monitoring/library/Monitoring/Backend/Ido/Query/NotificationhistoryQuery.php
index e557f4c7b..64c7e69b8 100644
--- a/modules/monitoring/library/Monitoring/Backend/Ido/Query/NotificationhistoryQuery.php
+++ b/modules/monitoring/library/Monitoring/Backend/Ido/Query/NotificationhistoryQuery.php
@@ -85,7 +85,8 @@ class NotificationhistoryQuery extends IdoQuery
             $this->select->group('n.object_id')
                 ->group('n.start_time')
                 ->group('n.output')
-                ->group('n.state');
+                ->group('n.state')
+                ->group('o.objecttype_id');
         }
 
         $this->joinedVirtualTables = array('history' => true);