diff --git a/lib/std.js b/lib/std.js
index 952ada3..4213d65 100644
--- a/lib/std.js
+++ b/lib/std.js
@@ -364,10 +364,9 @@ function StdEventableObject() {
     };
 };
 
-
-function AsyncFunction(f, owner) {
+function AsyncFunction(f, _filename) {
     this.f = f;
-	this.owner = owner;
+    this._filename = _filename;
 
     this.run = function() {
         var args = Array.from(arguments);
@@ -384,7 +383,7 @@ function AsyncFunction(f, owner) {
 
         // CLI or Window?
         if (typeof WScript !== "undefined") {
-            require("lib/shell").show(["cscript", "app.js", this.owner, f].concat(args));
+            require("lib/shell").show(["cscript", "app.js", this._filename, f].concat(args));
         } else {
             sleep(1, _f);
         }
@@ -394,8 +393,7 @@ function AsyncFunction(f, owner) {
         return this.f.apply(null, arguments);
     };
 };
-
-AsyncFunction.counter = 0;    // static variable
+AsyncFunction.counter = 0;
 AsyncFunction.bind = function(exports, args) {
     var result = false;