diff --git a/partner-kospinjasa.js b/partner-kospinjasa.js
index 625a14e..621d9d3 100644
--- a/partner-kospinjasa.js
+++ b/partner-kospinjasa.js
@@ -112,7 +112,8 @@ function topupRequestSoapDIY(task, params, retry) {
         method: "POST",
         headers: {
             'Content-Type': 'application/soap+xml',
-            'Content-Length': Buffer.byteLength(message)
+            'Content-Length': Buffer.byteLength(message),
+            'SOAPAction': 'billpayment'
         }
     };