diff --git a/ajax/event/move.php b/ajax/event/move.php
index fc969d4a0..7e4f5effa 100644
--- a/ajax/event/move.php
+++ b/ajax/event/move.php
@@ -35,7 +35,7 @@
 
 $now = new DateTime('now');
 $now->setTimeZone(new \DateTimeZone('UTC'));
-$vevent->__get('LAST-MODIFIED')->setDateTime($now);
+$vevent->__set('LAST-MODIFIED', $now);
 $vevent->DTSTAMP = $now;
 
 try {