diff --git a/package.json b/package.json
index ec892c5..6e84372 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
     "url": "https://github.com/cthackers/adm-zip.git"
   },
   "engines": {
-    "node": ">=0.3.0"
+    "node": ">=6.0"
   },
   "devDependencies": {
     "chai": "^4.1.2",
diff --git a/util/fattr.js b/util/fattr.js
index b56fbd7..be47676 100644
--- a/util/fattr.js
+++ b/util/fattr.js
@@ -26,8 +26,8 @@ module.exports = function(/*String*/path) {
         _obj.directory = _stat.isDirectory();
         _obj.mtime = _stat.mtime;
         _obj.atime = _stat.atime;
-        _obj.executable = !!(1 & parseInt ((_stat.mode & parseInt ("777", 8)).toString (8)[0]));
-        _obj.readonly = !!(2 & parseInt ((_stat.mode & parseInt ("777", 8)).toString (8)[0]));
+        _obj.executable = (0o111 & _stat.mode) != 0;    // file is executable who ever har right not just owner
+        _obj.readonly   = (0o200 & _stat.mode) == 0;    // readonly if owner has no write right
         _obj.hidden = pth.basename(_path)[0] === ".";
     } else {
         console.warn("Invalid path: " + _path)