diff --git a/core/lib/Drupal/Core/Entity/EntityManager.php b/core/lib/Drupal/Core/Entity/EntityManager.php
index b8de708..bd86e95 100644
--- a/core/lib/Drupal/Core/Entity/EntityManager.php
+++ b/core/lib/Drupal/Core/Entity/EntityManager.php
@@ -323,7 +323,7 @@ public function getController($entity_type, $controller_type, $controller_class_
    * {@inheritdoc}
    */
   public function getAdminRouteInfo($entity_type_id, $bundle) {
-    if (($entity_type = $this->getDefinition($entity_type_id, FALSE)) && $admin_form = $entity_type->getKey('field_ui_base_route')) {
+    if (($entity_type = $this->getDefinition($entity_type_id, FALSE)) && $admin_form = $entity_type->get('field_ui_base_route')) {
       return array(
         'route_name' => $admin_form,
         'route_parameters' => array(
diff --git a/core/lib/Drupal/Core/Entity/EntityType.php b/core/lib/Drupal/Core/Entity/EntityType.php
index ca24505..18036b3 100644
--- a/core/lib/Drupal/Core/Entity/EntityType.php
+++ b/core/lib/Drupal/Core/Entity/EntityType.php
@@ -195,6 +195,13 @@ class EntityType implements EntityTypeInterface {
   protected $group_label;
 
   /**
+   * The route name where field UI will use to attach its routes.
+   *
+   * @var string
+   */
+  protected $field_ui_base_route;
+
+  /**
    * Constructs a new EntityType.
    *
    * @param array $definition
diff --git a/core/modules/field_ui/src/FieldUI.php b/core/modules/field_ui/src/FieldUI.php
index 0d90e29..77ec651 100644
--- a/core/modules/field_ui/src/FieldUI.php
+++ b/core/modules/field_ui/src/FieldUI.php
@@ -28,7 +28,7 @@ class FieldUI {
    */
   public static function getOverviewRouteInfo($entity_type_id, $bundle) {
     $entity_type = \Drupal::entityManager()->getDefinition($entity_type_id);
-    if ($entity_type->hasKey('field_ui_base_route')) {
+    if ($entity_type->get('field_ui_base_route')) {
       return new Url("field_ui.overview_$entity_type_id", array(
         $entity_type->getBundleEntityType() => $bundle,
       ));
diff --git a/core/modules/field_ui/src/Plugin/Derivative/FieldUiLocalTask.php b/core/modules/field_ui/src/Plugin/Derivative/FieldUiLocalTask.php
index ba921e7..0108a3f 100644
--- a/core/modules/field_ui/src/Plugin/Derivative/FieldUiLocalTask.php
+++ b/core/modules/field_ui/src/Plugin/Derivative/FieldUiLocalTask.php
@@ -69,7 +69,7 @@ public function getDerivativeDefinitions($base_plugin_definition) {
     $this->derivatives = array();
 
     foreach ($this->entityManager->getDefinitions() as $entity_type_id => $entity_type) {
-      if ($entity_type->isFieldable() && $entity_type->hasKey('field_ui_base_route')) {
+      if ($entity_type->isFieldable() && $entity_type->get('field_ui_base_route')) {
         $this->derivatives["overview_$entity_type_id"] = array(
           'route_name' => "field_ui.overview_$entity_type_id",
           'weight' => 1,
@@ -172,8 +172,8 @@ public function getDerivativeDefinitions($base_plugin_definition) {
    */
   public function alterLocalTasks(&$local_tasks) {
     foreach ($this->entityManager->getDefinitions() as $entity_type => $entity_info) {
-      if ($entity_info->isFieldable() && $entity_info->hasKey('field_ui_base_route')) {
-        $admin_form = $entity_info->getKey('field_ui_base_route');
+      if ($entity_info->isFieldable() && $route_name = $entity_info->get('field_ui_base_route')) {
+        $admin_form = $route_name;
         $local_tasks["field_ui.fields:overview_$entity_type"]['base_route'] = $admin_form;
         $local_tasks["field_ui.fields:form_display_overview_$entity_type"]['base_route'] = $admin_form;
         $local_tasks["field_ui.fields:display_overview_$entity_type"]['base_route'] = $admin_form;
diff --git a/core/modules/field_ui/src/Routing/RouteSubscriber.php b/core/modules/field_ui/src/Routing/RouteSubscriber.php
index 01cc44c..4b371ab 100644
--- a/core/modules/field_ui/src/Routing/RouteSubscriber.php
+++ b/core/modules/field_ui/src/Routing/RouteSubscriber.php
@@ -41,9 +41,9 @@ public function __construct(EntityManagerInterface $manager) {
   protected function alterRoutes(RouteCollection $collection) {
     foreach ($this->manager->getDefinitions() as $entity_type_id => $entity_type) {
       $defaults = array();
-      if ($entity_type->isFieldable() && $entity_type->hasKey('field_ui_base_route')) {
+      if ($entity_type->isFieldable() && $route_name = $entity_type->get('field_ui_base_route')) {
         // Try to get the route from the current collection.
-        if (!$entity_route = $collection->get($entity_type->getKey('field_ui_base_route'))) {
+        if (!$entity_route = $collection->get($route_name)) {
           continue;
         }
         $path = $entity_route->getPath();
diff --git a/core/tests/Drupal/Tests/Core/Entity/EntityManagerTest.php b/core/tests/Drupal/Tests/Core/Entity/EntityManagerTest.php
index 1c218a1..dfadfc9 100644
--- a/core/tests/Drupal/Tests/Core/Entity/EntityManagerTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/EntityManagerTest.php
@@ -448,7 +448,7 @@ public function testGetAdminRouteInfo() {
       ->method('getBundleEntityType')
       ->will($this->returnValue('bundle'));
     $banana->expects($this->once())
-      ->method('getKey')
+      ->method('get')
       ->with('field_ui_base_route')
       ->will($this->returnValue('entity.view'));
     $this->setUpEntityManager(array(