diff --git a/QuickPay/api/Request.php b/QuickPay/api/Request.php
index 90327d8..62e2181 100644
--- a/QuickPay/api/Request.php
+++ b/QuickPay/api/Request.php
@@ -157,7 +157,7 @@ protected function execute( $request_type, $form = array() )
  		// If additional data is delivered, we will send it along with the API request
  		if( is_array( $form ) && ! empty( $form ) )
  		{
- 			curl_setopt( $this->client->ch, CURLOPT_POSTFIELDS, $form );
+ 			curl_setopt( $this->client->ch, CURLOPT_POSTFIELDS, http_build_query($form) );
  		}
 
  		// Execute the request