diff --git a/tests/Grant/PasswordGrantTest.php b/tests/Grant/PasswordGrantTest.php
index c90a83db..378fee6f 100644
--- a/tests/Grant/PasswordGrantTest.php
+++ b/tests/Grant/PasswordGrantTest.php
@@ -145,6 +145,7 @@ class PasswordGrantTest extends TestCase
 
     /**
      * @expectedException \League\OAuth2\Server\Exception\OAuthServerException
+     * @expectedExceptionCode 10
      */
     public function testRespondToRequestBadCredentials()
     {