diff --git a/xmlrpc-server.js b/xmlrpc-server.js
index 52947ba..9446a4b 100644
--- a/xmlrpc-server.js
+++ b/xmlrpc-server.js
@@ -280,7 +280,7 @@ function sendTopUpInquryToMaster(params, remoteAddress, responseToClient) {
 		url: config.inquiry_url,
 		qs: {
             REQUESTID: params.REQUESTID,
-			MSISDN: param.MSISDN,
+			MSISDN: params.MSISDN,
 			PIN: params.PIN,
 			NO_HP: params.NO_HP,
             TRUST: 'NO_TRUST',