diff --git a/core/lib/Drupal/Core/Entity/EntityManager.php b/core/lib/Drupal/Core/Entity/EntityManager.php
index 0a87898..4b0755f 100644
--- a/core/lib/Drupal/Core/Entity/EntityManager.php
+++ b/core/lib/Drupal/Core/Entity/EntityManager.php
@@ -1028,13 +1028,11 @@ protected function getDisplayModeOptions($display_type, $entity_type_id) {
    *   An array of display mode labels, keyed by the display mode ID.
    */
   protected function getDisplayModeOptionsByBundle($display_type, $entity_type_id, $bundle, $include_disabled) {
-    $options = array('default' => t('Default'));
-
     // Collect all the entity's display modes.
     $display_modes = $this->getDisplayModeOptions($display_type, $entity_type_id);
 
-    // Remove the displays that are not set to active for this bundle if they
-    // should not be returned.
+    // Remove the display modes that are not set to active for this bundle if
+    // they should not be returned.
     if (!$include_disabled) {
       $load_ids = array();
       // Get the list of available entity displays for the current bundle.
@@ -1050,12 +1048,12 @@ protected function getDisplayModeOptionsByBundle($display_type, $entity_type_id,
       foreach (array_keys($display_modes) as $mode) {
         $display_id = $entity_type_id . '.' . $bundle . '.' . $mode;
         if (!isset($displays[$display_id]) || !$displays[$display_id]->status()) {
-          unset($options[$mode]);
+          unset($display_modes[$mode]);
         }
       }
     }
 
-    return $options;
+    return $display_modes;
   }
 
   /**