diff --git a/lib/class.js b/lib/class.js
index 78dbf74..f448478 100644
--- a/lib/class.js
+++ b/lib/class.js
@@ -22,7 +22,8 @@
  * @package core
  */
 
-var util = require( './util' );
+var util           = require( './util' ),
+    member_builder = require( './member_builder' );
 
 /**
  * Stores class metadata internally (ensures data is encapsulated)
@@ -213,6 +214,7 @@ var extend = ( function( extending )
             prototype = new base();
 
         var properties       = {},
+            members          = member_builder.initMembers( prototype ),
             abstract_methods = ( base.abstractMethods || [] ).slice();
 
         util.propCopy( props, prototype, {