diff --git a/core/modules/block/lib/Drupal/block/Routing/RouteSubscriber.php b/core/modules/block/lib/Drupal/block/Routing/RouteSubscriber.php
index b1c72bc..8abc3c4 100644
--- a/core/modules/block/lib/Drupal/block/Routing/RouteSubscriber.php
+++ b/core/modules/block/lib/Drupal/block/Routing/RouteSubscriber.php
@@ -46,8 +46,11 @@ public function routes(RouteBuildEvent $event) {
           'theme' => $key,
         ),
         array(
-          '_theme_access' => 'TRUE',
+          '_access_theme' => 'TRUE',
           '_permission' => 'administer blocks',
+        ),
+        array(
+          '_access_mode' => 'ALL',
         )
       );
       $collection->add("block_admin_display.$key", $route);