diff --git a/core/modules/user/src/Tests/UserLoginTest.php b/core/modules/user/src/Tests/UserLoginTest.php
index af00c74..2d66fc7 100644
--- a/core/modules/user/src/Tests/UserLoginTest.php
+++ b/core/modules/user/src/Tests/UserLoginTest.php
@@ -156,7 +156,7 @@ function testPasswordRehashOnLogin() {
    */
   function assertFailedLogin($account, $flood_trigger = NULL) {
     $edit = array(
-      'name' => $account->getUsername(),
+      'name' => $account->getDisplayName(),
       'pass' => $account->pass_raw,
     );
     $this->drupalPostForm('user/login', $edit, t('Log in'));