diff --git a/apps/calendar/import.php b/apps/calendar/import.php
index e31d8bbdc6..4682234944 100644
--- a/apps/calendar/import.php
+++ b/apps/calendar/import.php
@@ -7,7 +7,7 @@
  */
 
 require_once ('../../lib/base.php');
-//OC_JSON::checkLoggedIn();
+OC_JSON::checkLoggedIn();
 OC_Util::checkAppEnabled('calendar');
 
 if($_GET["import"] == "existing"){