diff --git a/lib/cloudfunc.js b/lib/cloudfunc.js
index 824e386c..675a8a17 100644
--- a/lib/cloudfunc.js
+++ b/lib/cloudfunc.js
@@ -290,7 +290,7 @@ CloudFunc.checkExtension=function(pName,pExt)
             return lExtSub===pExt.length;
     
     }else if(typeof pExt === 'object' &&
-        pName.length){
+        pExt.length){
             for(var i=0; i < pName.length; i++)
                 if(this.checkExtension(pName, pExt[i]));
                     return true;