diff --git a/cake/libs/session.php b/cake/libs/session.php
index 7df6577df57..1368656898e 100644
--- a/cake/libs/session.php
+++ b/cake/libs/session.php
@@ -152,7 +152,7 @@ function __construct($base = null, $start = true) {
 				$this->host = substr($this->host, 0, strpos($this->host, ':'));
 			}
 		}
-		if (isset($_SESSION)) {
+		if (isset($_SESSION) || $start === true) {
 			if (!class_exists('Security')) {
 				App::import('Core', 'Security');
 			}