diff --git a/src/Symfony/Component/Security/Http/Firewall/UsernamePasswordJsonAuthenticationListener.php b/src/Symfony/Component/Security/Http/Firewall/UsernamePasswordJsonAuthenticationListener.php
index 7cb5102e97..d2d77f0a13 100644
--- a/src/Symfony/Component/Security/Http/Firewall/UsernamePasswordJsonAuthenticationListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/UsernamePasswordJsonAuthenticationListener.php
@@ -191,7 +191,9 @@ class UsernamePasswordJsonAuthenticationListener extends AbstractListener implem
         }
 
         if (!$this->failureHandler) {
-            return new JsonResponse(['error' => $failed->getMessageKey()], 401);
+            $errorMessage = strtr($failed->getMessageKey(), $failed->getMessageData());
+
+            return new JsonResponse(['error' => $errorMessage], 401);
         }
 
         $response = $this->failureHandler->onAuthenticationFailure($request, $failed);