diff --git a/lib/js2xml.js b/lib/js2xml.js
index 44aa290..d9aea8f 100644
--- a/lib/js2xml.js
+++ b/lib/js2xml.js
@@ -39,8 +39,8 @@ exports.Js2Xml = (function() {
     return this;
   };
 
-  Js2Xml.prototype.toString = function() {
-    return this.doc.toString();
+  Js2Xml.prototype.toString = function(parameter) {
+    return this.doc.toString(parameter);
   };
 
   return Js2Xml;