diff --git a/lib/convert.js b/lib/convert.js
index 9855617..dca93ce 100644
--- a/lib/convert.js
+++ b/lib/convert.js
@@ -4,6 +4,10 @@ var ejs = require('ejs');
 var fs = require('fs');
 var template = ejs.compile(fs.readFileSync('./lib/template.ejs','utf8'));
 
+function isArray(a){
+  return (typeof a.length == 'number' && typeof a.forEach == 'function');
+}
+
 // source the files
 
 module.exports = function(stream,opts,callback){
@@ -79,7 +83,7 @@ function buildUp(jsonObj,opts){
 	if (item["activity:object"] && item["activity:object"].link){
 		
 	  
-	  if (Array.isArrray(item["activity:object"].link) ){
+	  if (isArrray(item["activity:object"].link) ){
 	      item["activity:object"].link.forEach(parseLink);
 	  }else if (typeof item["activity:object"].link == 'object'){
               parseLink(item["activity:object"].link);