diff --git a/core/modules/user/lib/Drupal/user/Tests/UserAutocompleteTest.php b/core/modules/user/lib/Drupal/user/Tests/UserAutocompleteTest.php
index 3777fb6..9c3841d 100644
--- a/core/modules/user/lib/Drupal/user/Tests/UserAutocompleteTest.php
+++ b/core/modules/user/lib/Drupal/user/Tests/UserAutocompleteTest.php
@@ -47,15 +47,12 @@ function testUserAutocomplete() {
     // Using first letter of the user's name, make sure the user's full name is in the results.
     $this->assertRaw($this->unprivileged_user->name, 'User name found in autocompletion results.');
 
-    // Test that anonymous username is in the result.
     $anonymous_name = $this->randomString();
     config('user.settings')->set('anonymous', $anonymous_name)->save();
-    $this->drupalGet('user/autocomplete', array('query' => array('q' => drupal_substr($anonymous_name, 0, 4), 'anonymous' => '1')));
-    // Encode the anonymous name in the same way as JsonResponse does.
-    // @see \Symfony\Component\HttpFoundation\JsonResponse::setData()
-    $anonymous_name_safe = json_encode($anonymous_name, JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_AMP | JSON_HEX_QUOT);
-    $this->assertRaw($anonymous_name_safe, 'The anonymous name found in autocompletion results.');
-    $this->drupalGet('user/autocomplete', array('query' => array('q' => drupal_substr($anonymous_name, 0, 4))));
-    $this->assertNoRaw($anonymous_name_safe, 'The anonymous name not found in autocompletion results without enabling anonymous username.');
+    // Test that anonymous username is in the result when requested.
+    $users = $this->drupalGetAjax('user/autocomplete', array('query' => array('q' => drupal_substr($anonymous_name, 0, 4), 'anonymous' => '1')));
+    $this->assertTrue(isset($users[$anonymous_name]), 'The anonymous name found in autocompletion results.');
+    $users = $this->drupalGetAjax('user/autocomplete', array('query' => array('q' => drupal_substr($anonymous_name, 0, 4))));
+    $this->assertFalse(isset($users[$anonymous_name]), 'The anonymous name not found in autocompletion results without enabling anonymous username.');
   }
 }