diff --git a/src/Curl/Curl.php b/src/Curl/Curl.php
index 23aa7f0..ba8cc2d 100644
--- a/src/Curl/Curl.php
+++ b/src/Curl/Curl.php
@@ -444,7 +444,7 @@ class Curl
         $this->setURL($url);
         $this->unsetHeader('Content-Length');
         $this->setOpt(CURLOPT_CUSTOMREQUEST, 'PATCH');
-        $this->setOpt(CURLOPT_POSTFIELDS, $data);
+        $this->setOpt(CURLOPT_POSTFIELDS, $this->buildPostData($data));
         return $this->exec();
     }