diff --git a/knockout.dirtiable.js b/knockout.dirtiable.js
index 91b5b23..73eb3ba 100644
--- a/knockout.dirtiable.js
+++ b/knockout.dirtiable.js
@@ -2,33 +2,18 @@
  * based on the the work done by Ryan Niemeyer.  
  * (http://www.knockmeout.net/2011/05/creating-smart-dirty-flag-in-knockoutjs.html)
  */ 
-ko.extenders.dirtiable = function(target) {
-    var _dirty = {};
-    _dirty.isDirty = ko.observable(false);
-    _dirty.initialState = null;
-    _dirty.tracker = ko.computed(function() {
-        if(!_dirty.isDirty())
-            ko.toJSON(target);
-            
-        return(_dirty.isDirty());
+ko.extenders.dirtiable = function (target) {
+    var _initialState = ko.observable(ko.toJSON(target)),
+        _isInitiallyDirty = ko.observable(false);
+
+    target.dirty = ko.computed(function () {
+        return _isInitiallyDirty() || _initialState() !== ko.toJSON(target);
     });
-    
-    //Track changes to observable
-    _dirty.tracker.subscribe(function() {
-        if(!_dirty.isDirty() && _dirty.initialState !== ko.toJSON(target))
-            _dirty.isDirty(true);
-    });
-    
-    //Create the dirty flag on the observable
-    target.dirty = ko.computed(function() {
-        return(_dirty.isDirty());
-    });
-        
-    //Allow users to reset the dirty flag
-    target.clean = function() {
-        _dirty.initialState = ko.toJSON(target);
-        _dirty.isDirty(false);
-    }
-    
+
+    target.clean = function () {
+        _initialState(ko.toJSON(target));
+        _isInitiallyDirty(false);
+    };
+
     return target;
-}
\ No newline at end of file
+};