diff --git a/core/lib/Drupal/Core/EventSubscriber/SpecialAttributesRouteSubscriber.php b/core/lib/Drupal/Core/EventSubscriber/SpecialAttributesRouteSubscriber.php
index 39f9ceb..ca1d1b7 100644
--- a/core/lib/Drupal/Core/EventSubscriber/SpecialAttributesRouteSubscriber.php
+++ b/core/lib/Drupal/Core/EventSubscriber/SpecialAttributesRouteSubscriber.php
@@ -46,18 +46,4 @@ protected function alterRoutes(RouteCollection $collection, $module) {
     return TRUE;
   }
 
-  /**
-   * Delegates the route altering to self::alterRoutes().
-   *
-   * @param \Drupal\Core\Routing\RouteBuildEvent $event
-   *   The route build event.
-   *
-   * @return bool
-   *   Returns TRUE if the variables were succesfully replaced, otherwise FALSE.
-   */
-  public function onAlterRoutes(RouteBuildEvent $event) {
-    $collection = $event->getRouteCollection();
-    return $this->alterRoutes($collection, $event->getModule());
-  }
-
 }
diff --git a/core/lib/Drupal/Core/Routing/RouteSubscriberBase.php b/core/lib/Drupal/Core/Routing/RouteSubscriberBase.php
index 615a820..840e4bf 100644
--- a/core/lib/Drupal/Core/Routing/RouteSubscriberBase.php
+++ b/core/lib/Drupal/Core/Routing/RouteSubscriberBase.php
@@ -68,7 +68,7 @@ public function onDynamicRoutes(RouteBuildEvent $event) {
    */
   public function onAlterRoutes(RouteBuildEvent $event) {
     $collection = $event->getRouteCollection();
-    $this->alterRoutes($collection, $event->getModule());
+    return $this->alterRoutes($collection, $event->getModule());
   }
 
 }
diff --git a/core/modules/system/tests/modules/form_test/lib/Drupal/form_test/EventSubscriber/FormTestEventSubscriber.php b/core/modules/system/tests/modules/form_test/lib/Drupal/form_test/EventSubscriber/FormTestEventSubscriber.php
index 552398b..20215fb 100644
--- a/core/modules/system/tests/modules/form_test/lib/Drupal/form_test/EventSubscriber/FormTestEventSubscriber.php
+++ b/core/modules/system/tests/modules/form_test/lib/Drupal/form_test/EventSubscriber/FormTestEventSubscriber.php
@@ -50,9 +50,8 @@ public function onKernelRequest(GetResponseEvent $event) {
    * {@inheritdoc}
    */
   public static function getSubscribedEvents() {
+    $events = parent::getSubscribedEvents();
     $events[KernelEvents::REQUEST][] = array('onKernelRequest');
-    $events[RoutingEvents::DYNAMIC] = 'onDynamicRoutes';
-    $events[RoutingEvents::ALTER] = 'onAlterRoutes';
     return $events;
   }