diff --git a/lib/partner.js b/lib/partner.js
index ebfd01d..839f421 100644
--- a/lib/partner.js
+++ b/lib/partner.js
@@ -50,7 +50,7 @@ function buy(task) {
 function _topUpRequest(task, isAdvice) {
     const params = {
         MSISDN: config.partner.msisdn || config.partner.userid,
-        REQUESTID: task.trx_id,
+        REQUESTID: task.trx_id.toString(),
         PIN: config.partner.pin || config.partner.password,
         NOHP: task.destination,
         NOM: task.remote_product
@@ -112,7 +112,7 @@ function _topUpRequest(task, isAdvice) {
 
 function _topUpInquiry(task) {
     const params = {
-        REQUESTID: task.trx_id,
+        REQUESTID: task.trx_id.toString(),
         MSISDN: config.partner.msisdn || config.partner.userid,
         PIN: config.partner.pin || config.partner.password,
         NOHP: task.destination