diff --git a/cake/libs/session.php b/cake/libs/session.php
index a7934acd8..848843ef4 100644
--- a/cake/libs/session.php
+++ b/cake/libs/session.php
@@ -128,9 +128,9 @@ class CakeSession extends Object{
 
 		$this->__initSession();
 		session_cache_limiter ("must-revalidate");
-		session_start();
 
 		if (!isset($_SESSION)) {
+			session_start();
 			$this->__begin();
 		}
 		$this->__checkValid();