diff --git a/lib/Client.php b/lib/Client.php
index 1766dd0..610d60e 100644
--- a/lib/Client.php
+++ b/lib/Client.php
@@ -192,7 +192,7 @@ private function createCurlOptions($method, $body = null, $headers = null)
         if (isset($headers)) {
             $headers = array_merge($this->headers, $headers);
         } else {
-            $headers = [];
+            $headers = $this->headers;
         }
 
         if (isset($body)) {