diff --git a/apps/dav/lib/AppInfo/Application.php b/apps/dav/lib/AppInfo/Application.php
index 202d5cb9bad..3e68dc0c8c4 100644
--- a/apps/dav/lib/AppInfo/Application.php
+++ b/apps/dav/lib/AppInfo/Application.php
@@ -331,11 +331,11 @@ class Application extends App implements IBootstrap {
 				]);
 
 				/** @var CalDavBackend $calDavBackend */
-				$calDavBackend = $container->query(CalDavBackend::class);
+				$calDavBackend = $container->get(CalDavBackend::class);
 				$calDavBackend->purgeAllCachedEventsForSubscription($subscriptionData['id']);
 				/** @var ReminderBackend $calDavBackend */
-				$reminderBackend = $container->query(ReminderBackend::class);
-				$reminderBackend->cleanRemindersForCalendar($subscriptionData['id']);
+				$reminderBackend = $container->get(ReminderBackend::class);
+				$reminderBackend->cleanRemindersForCalendar((int) $subscriptionData['id']);
 			}
 		);