diff --git a/lib/class.js b/lib/class.js
index 2161d44..3908351 100644
--- a/lib/class.js
+++ b/lib/class.js
@@ -113,7 +113,7 @@ exports.extend = function( base )
  *
  * @return  {Object}  extended class
  */
-Object.defineProperty( Class.prototype, 'extend',
+Object.defineProperty( Class, 'extend',
 {
     value: function( props )
     {