diff --git a/core/lib/Drupal/Core/EventSubscriber/AccessSubscriber.php b/core/lib/Drupal/Core/EventSubscriber/AccessSubscriber.php
index cb1cb76..f990ed4 100644
--- a/core/lib/Drupal/Core/EventSubscriber/AccessSubscriber.php
+++ b/core/lib/Drupal/Core/EventSubscriber/AccessSubscriber.php
@@ -67,7 +67,7 @@ public function onRoutingRouteAlterSetAccessCheck(RoutesEvent $event) {
   static function getSubscribedEvents() {
     $events[KernelEvents::REQUEST][] = array('onKernelRequestAccessCheck', 30);
     // Setting very low priority to ensure access checks are run after alters.
-    $events[RoutingEvents::ROUTE_ALTER][] = array('onRoutingRouteAlterSetAccessCheck', 900);
+    $events[RoutingEvents::ROUTE_ALTER][] = array('onRoutingRouteAlterSetAccessCheck', 0);
 
     return $events;
   }
diff --git a/core/lib/Drupal/Core/Routing/RoutingEvents.php b/core/lib/Drupal/Core/Routing/RoutingEvents.php
index 2409e4b..aebfeaf 100644
--- a/core/lib/Drupal/Core/Routing/RoutingEvents.php
+++ b/core/lib/Drupal/Core/Routing/RoutingEvents.php
@@ -10,8 +10,7 @@
 /**
  * Contains all events thrown in the core routing component.
  */
-final class RoutingEvents
-{
+final class RoutingEvents {
     /**
      * The ROUTE_ALTER event is fired when a collection of routes have been
      * added to the route builder.