diff --git a/src/EventSubscriber/CheckTwofactorSubscriber.php b/src/EventSubscriber/CheckTwofactorSubscriber.php
index 2261f7454104266c619a94dc5ec8ebc19ade568e..8f5ed5d70d49052c5659742a0f514a86691545a4 100644
--- a/src/EventSubscriber/CheckTwofactorSubscriber.php
+++ b/src/EventSubscriber/CheckTwofactorSubscriber.php
@@ -25,7 +25,7 @@ class CheckTwofactorSubscriber implements EventSubscriberInterface {
   /**
    * {@inheritdoc}
    */
-  static function getSubscribedEvents() {
+  static function getSubscribedEvents(): array {
     $events[KernelEvents::REQUEST][] = array('checkTwofactor');
     return $events;
   }