diff --git a/lib/server/appcache.js b/lib/server/appcache.js
index e0f445c1..fd7b827b 100644
--- a/lib/server/appcache.js
+++ b/lib/server/appcache.js
@@ -19,7 +19,7 @@ setWatachFunctions();
 /* function add file or files to manifest */
 exports.addFiles = function(pFileNames_a){
     if(pFileNames_a instanceof Array)
-        for(var i=0; i < pFileNames_a.Length; i++)
+        for(var i=0; i < pFileNames_a.length; i++)
             exports.watch(pFileNames_a[i]);
     else
         exports.watch(pFileNames_a);