diff --git a/calendar/inc/class.calendar_ical.inc.php b/calendar/inc/class.calendar_ical.inc.php
index 562dd19b35..0930be8ba0 100644
--- a/calendar/inc/class.calendar_ical.inc.php
+++ b/calendar/inc/class.calendar_ical.inc.php
@@ -1562,7 +1562,7 @@ class calendar_ical extends calendar_boupdate
 					$dtend_ts = is_numeric($attributes['value']) ? $attributes['value'] : $this->date2ts($attributes['value']);
 					if (date('H:i:s',$dtend_ts) == '00:00:00')
 					{
-						$dtend_ts -= 60;
+						$dtend_ts -= 1;
 					}
 					$vcardData['end']	= $dtend_ts;
 			}