diff --git a/calendar/inc/class.calendar_boupdate.inc.php b/calendar/inc/class.calendar_boupdate.inc.php
index 9428ebb124..7dbbef7f61 100644
--- a/calendar/inc/class.calendar_boupdate.inc.php
+++ b/calendar/inc/class.calendar_boupdate.inc.php
@@ -1334,8 +1334,8 @@ class calendar_boupdate extends calendar_bo
 				// remove alarms belonging to not longer existing or rejected participants
 				if ($alarm['owner'] && isset($expanded['participants']))
 				{
-					// Don't auto-delete alarm if created by event owner
-					if($alarm['all'] && $alarm['owner'] == $event['owner']) continue;
+					// Don't auto-delete alarm if for all users
+					if($alarm['all']) continue;
 
 					$status = $expanded['participants'][$alarm['owner']];
 					if (!isset($status) || calendar_so::split_status($status) === 'R')