diff --git a/partner-datacell.js b/partner-datacell.js
index b4847bf..5171942 100644
--- a/partner-datacell.js
+++ b/partner-datacell.js
@@ -86,7 +86,7 @@ function topupRequest(task, retry) {
         var buffer = "";
         res.on( "data", function( data ) { buffer = buffer + data; } );
         res.on( "end", function( data ) {             
-                topupResponseHandler(data);
+                topupResponseHandler(buffer);
         });
 
     });