diff --git a/partner-kospinjasa.js b/partner-kospinjasa.js
index 572f115..d51eebb 100644
--- a/partner-kospinjasa.js
+++ b/partner-kospinjasa.js
@@ -112,7 +112,7 @@ function topupRequestSoapDIY(task, params, retry) {
         headers: {
             'Content-Type': 'application/soap+xml',
             'Content-Length': Buffer.byteLength(message),
-            'SOAPAction': ''
+            'SOAPAction': "urn:apih2h#billpayment"
         }
     };