diff --git a/lib/model-builder.js b/lib/model-builder.js
index 2b2bf733..a0668ad7 100644
--- a/lib/model-builder.js
+++ b/lib/model-builder.js
@@ -109,10 +109,16 @@ ModelBuilder.prototype.define = function defineClass(className, properties, sett
     buildSchema(className, properties);
 
     // every class can receive hash of data as optional param
-    var ModelClass = function ModelConstructor(data, schema) {        
+    var ModelClass = function ModelConstructor(data, schema) {   
         ModelBaseClass.apply(this, arguments);
         hiddenProperty(this, 'schema', schema || this.constructor.schema);
     };
+    
+    // mix in EventEmitter
+    var events = new EventEmitter();
+    ModelClass.on = events.on.bind(events);
+    ModelClass.once = events.once.bind(events);
+    ModelClass.emit = events.emit.bind(events);
 
     hiddenProperty(ModelClass, 'schema', schema);
     hiddenProperty(ModelClass, 'modelName', className);
@@ -370,7 +376,7 @@ ModelBuilder.prototype.copyModel = function copyModel(Master) {
  */
 function hiddenProperty(where, property, value) {
     Object.defineProperty(where, property, {
-        writable: false,
+        writable: true,
         enumerable: false,
         configurable: true,
         value: value