diff --git a/lib/OAuth2ServerException.php b/lib/OAuth2ServerException.php
index 1655741..35c0e05 100644
--- a/lib/OAuth2ServerException.php
+++ b/lib/OAuth2ServerException.php
@@ -68,7 +68,7 @@ public function getHttpResponse()
     {
         return new Response(
             $this->getResponseBody(),
-            $this->getHttpCode(),
+            (int) $this->getHttpCode(),
             $this->getResponseHeaders()
         );
     }