diff --git a/core/modules/field_ui/lib/Drupal/field_ui/Access/FormModeAccessCheck.php b/core/modules/field_ui/lib/Drupal/field_ui/Access/FormModeAccessCheck.php
index 3322c9e..7b06250 100644
--- a/core/modules/field_ui/lib/Drupal/field_ui/Access/FormModeAccessCheck.php
+++ b/core/modules/field_ui/lib/Drupal/field_ui/Access/FormModeAccessCheck.php
@@ -46,7 +46,7 @@ public function appliesTo() {
    * {@inheritdoc}
    */
   public function access(Route $route, Request $request, AccountInterface $account) {
-    if ($entity_type = $request->attributes->get('entity_type')) {
+    if ($entity_type = $route->getDefault('entity_type')) {
       $form_mode = $request->attributes->get('form_mode_name');
 
       if (!($bundle = $request->attributes->get('bundle'))) {
diff --git a/core/modules/field_ui/lib/Drupal/field_ui/Access/ViewModeAccessCheck.php b/core/modules/field_ui/lib/Drupal/field_ui/Access/ViewModeAccessCheck.php
index 5e69daf..bb94f0b 100644
--- a/core/modules/field_ui/lib/Drupal/field_ui/Access/ViewModeAccessCheck.php
+++ b/core/modules/field_ui/lib/Drupal/field_ui/Access/ViewModeAccessCheck.php
@@ -46,7 +46,7 @@ public function appliesTo() {
    * {@inheritdoc}
    */
   public function access(Route $route, Request $request, AccountInterface $account) {
-    if ($entity_type = $request->attributes->get('entity_type')) {
+    if ($entity_type = $route->getDefault('entity_type')) {
       $view_mode = $request->attributes->get('view_mode_name');
 
       if (!($bundle = $request->attributes->get('bundle'))) {