diff --git a/calendar/inc/class.calendar_sif.inc.php b/calendar/inc/class.calendar_sif.inc.php
index 582895f602..bb8d5cd60f 100644
--- a/calendar/inc/class.calendar_sif.inc.php
+++ b/calendar/inc/class.calendar_sif.inc.php
@@ -101,6 +101,7 @@ class calendar_sif extends calendar_boupdate
 
 	function siftoegw($_sifdata) {
 		$vcal		= new Horde_iCalendar;
+		$this->event = array();
 		$finalEvent	= array();
 		$sysCharSet	= $GLOBALS['egw']->translation->charset();
 		#error_log($sifData);