diff --git a/src/Amadeus/Client/Session/Handler/SoapHeader4.php b/src/Amadeus/Client/Session/Handler/SoapHeader4.php
index 0e8da2dda..de2d47914 100644
--- a/src/Amadeus/Client/Session/Handler/SoapHeader4.php
+++ b/src/Amadeus/Client/Session/Handler/SoapHeader4.php
@@ -259,6 +259,7 @@ protected function prepareForNextMessage($messageName, $messageOptions)
 
         $headers = $this->createSoapHeaders($this->sessionData, $this->params, $messageName, $messageOptions);
 
+        $this->getSoapClient()->__setSoapHeaders(null);
         $this->getSoapClient()->__setSoapHeaders($headers);
     }