diff --git a/lib/Cake/bootstrap.php b/lib/Cake/bootstrap.php
index e034b5566..76be5ec55 100644
--- a/lib/Cake/bootstrap.php
+++ b/lib/Cake/bootstrap.php
@@ -18,6 +18,8 @@
  * @since         CakePHP(tm) v 0.2.9
  * @license       MIT License (http://www.opensource.org/licenses/mit-license.php)
  */
+define('TIME_START', microtime(true));
+
 if (!defined('E_DEPRECATED')) {
 	define('E_DEPRECATED', 8192);
 }