diff --git a/AddOn/Calender_Office365_User/calendar.php b/AddOn/Calender_Office365_User/calendar.php
index 28991dfe..ec1d608f 100644
--- a/AddOn/Calender_Office365_User/calendar.php
+++ b/AddOn/Calender_Office365_User/calendar.php
@@ -57,7 +57,7 @@ if (isset($_GET['update'])) {
 }
 
 // Termin löschen
-if (isset($_GET['deleteEvent'])) {
+if (isset($_GET['delete'])) {
     $eventId = $_GET['eventId'] ?? null;
     if (!$eventId) {
         die("Bitte eventId angeben.");