diff --git a/core/modules/user/lib/Drupal/user/Tests/UserAutocompleteTest.php b/core/modules/user/lib/Drupal/user/Tests/UserAutocompleteTest.php
index 42ac626..1310a2a 100644
--- a/core/modules/user/lib/Drupal/user/Tests/UserAutocompleteTest.php
+++ b/core/modules/user/lib/Drupal/user/Tests/UserAutocompleteTest.php
@@ -49,8 +49,8 @@ function testUserAutocomplete() {
 
     // Using anonymous user's name, make sure it's in the result.
     $anonymous_name = $this->randomName();
-    config('user')->set('anonymous', $anonymous_name)->save();
-    $this->drupalGet('user/autocomplete/' . drupal_substr($anonymous_name, 0, 4));
+    config('user.settings')->set('anonymous', $anonymous_name)->save();
+    $this->drupalGet('user/autocomplete', array('query' => array('q' => drupal_substr($anonymous_name, 0, 4))));
     $this->assertRaw($anonymous_name, 'The anonymous name found in autocompletion results.');
   }
 }
diff --git a/core/modules/user/user.pages.inc b/core/modules/user/user.pages.inc
index cf9c655..49cd2e7 100644
--- a/core/modules/user/user.pages.inc
+++ b/core/modules/user/user.pages.inc
@@ -17,7 +17,7 @@
 function user_autocomplete() {
   $matches = array();
   if ($string = drupal_container()->get('request')->query->get('q')) {
-    $anonymous_name = config('user')->get('anonymous');
+    $anonymous_name = config('user.settings')->get('anonymous');
     // Allow to autocomplete for the anonymous user.
     if (stripos($anonymous_name, $string) !== FALSE) {
       $matches[$anonymous_name] = $anonymous_name;