diff --git a/Message/Http/Request.php b/Message/Http/Request.php
index 01f586df9..581f3d191 100644
--- a/Message/Http/Request.php
+++ b/Message/Http/Request.php
@@ -140,7 +140,7 @@ final class Request extends RequestAbstract
                     throw new \Exception('Is not valid json ' . $input);
                 }
 
-                $this->data += $json;
+                $this->data = $json + $this->data;
             } elseif (\stripos($_SERVER['CONTENT_TYPE'], 'application/x-www-form-urlencoded') !== false) {
                 $content = \file_get_contents('php://input');