diff --git a/calendar/inc/class.uicalendar.inc.php b/calendar/inc/class.uicalendar.inc.php
index 487da3f1d5..4bcde19a06 100755
--- a/calendar/inc/class.uicalendar.inc.php
+++ b/calendar/inc/class.uicalendar.inc.php
@@ -3971,7 +3971,7 @@
 				}
 				$var['participants'] = array(
 					'field'	=> lang('Participants'),
-					'data'	=> "\n   ".$GLOBALS['phpgw']->uiaccountsel->selection('participants[]','uicalendar_select_participants',$event['participants'],'calendar',7,$event['owner']),
+					'data'	=> "\n   ".$GLOBALS['phpgw']->uiaccountsel->selection('participants[]','uicalendar_select_participants',$event['participants'],'calendar+',7,$event['owner']),
 				);
 /*
 // External Participants