diff --git a/src/Symfony/Bundle/SecurityBundle/Tests/Functional/SecurityTest.php b/src/Symfony/Bundle/SecurityBundle/Tests/Functional/SecurityTest.php
index ab39d637c3..1f41e2646d 100644
--- a/src/Symfony/Bundle/SecurityBundle/Tests/Functional/SecurityTest.php
+++ b/src/Symfony/Bundle/SecurityBundle/Tests/Functional/SecurityTest.php
@@ -129,6 +129,7 @@ final class UserWithoutEquatable implements UserInterface
      */
     public function getSalt()
     {
+        return null;
     }
 
     /**