diff --git a/src/Curl/Curl.php b/src/Curl/Curl.php
index 9c79cf2..da218ed 100644
--- a/src/Curl/Curl.php
+++ b/src/Curl/Curl.php
@@ -109,7 +109,7 @@ class Curl
                             $data = $json_str;
                         }
                     } else {
-                        $data = http_build_query($data);
+                        $data = http_build_query($data, '', '&');
                     }
                 }
             }