diff --git a/src/RequestBody.php b/src/RequestBody.php
index 38b6a0b..36a7559 100644
--- a/src/RequestBody.php
+++ b/src/RequestBody.php
@@ -51,7 +51,7 @@ public function __construct($contents, $encoding = '8bit')
 
             case 'object':
             case 'array':
-                $str = json_encode(json_encode($contents);
+                $str = json_encode(json_encode($contents));
                 break;
 
             case 'boolean':