diff --git a/calendar/inc/class.calendar_boupdate.inc.php b/calendar/inc/class.calendar_boupdate.inc.php
index 61932fd5ee..09fc48cf2a 100644
--- a/calendar/inc/class.calendar_boupdate.inc.php
+++ b/calendar/inc/class.calendar_boupdate.inc.php
@@ -1318,7 +1318,7 @@ class calendar_boupdate extends calendar_bo
 			$event['created'] = $this->now;
 			$event['creator'] = $this->user;
 		}
-		$set_recurrences = $old_event ? $event['recur_enddate'] != $old_event['recur_enddate'] : false;
+		$set_recurrences = $old_event ? $event['recur_enddate'] != $old_event['recur_enddate']+1 : false;
 		$set_recurrences_start = 0;
 		if (($cal_id = $this->so->save($event,$set_recurrences,$set_recurrences_start,0,$event['etag'])) && $set_recurrences && $event['recur_type'] != MCAL_RECUR_NONE)
 		{