diff --git a/lib/partner.js b/lib/partner.js
index c6a5a1a..78a78cf 100644
--- a/lib/partner.js
+++ b/lib/partner.js
@@ -64,7 +64,7 @@ function _topUpRequest(task, isAdvice) {
 
         if (err) {
 
-            let msg = `XMLRPC Client Error: ${err}. Status Code: ${err && err.res && err.res.statusCode ? err.res.statusCode : '-'}. Raw response body: ${err.body}`;
+            const msg = `XMLRPC Client Error: ${err}. HTTP status code: ${err && err.res && err.res.statusCode ? err.res.statusCode : '-'}. Raw response body: ${err.body}`;
             let rc = '68';
 
             if (