diff --git a/cake/libs/controller/components/auth.php b/cake/libs/controller/components/auth.php
index a8744ce25..a638fd567 100644
--- a/cake/libs/controller/components/auth.php
+++ b/cake/libs/controller/components/auth.php
@@ -339,7 +339,7 @@ class AuthComponent extends Object {
 					$this->Session->setFlash($this->authError, 'default', array(), 'auth');
 					if (!empty($controller->params['url']) && count($controller->params['url']) >= 2) {
 						$query = $controller->params['url'];
-						unset($query['url']);
+						unset($query['url'], $query['ext']);
 						$url .= Router::queryString($query, array());
 					}
 					$this->Session->write('Auth.redirect', $url);
diff --git a/cake/tests/cases/libs/controller/components/auth.test.php b/cake/tests/cases/libs/controller/components/auth.test.php
index 3cdb25bb7..00bf8a9c6 100644
--- a/cake/tests/cases/libs/controller/components/auth.test.php
+++ b/cake/tests/cases/libs/controller/components/auth.test.php
@@ -728,6 +728,7 @@ class AuthTest extends CakeTestCase {
 		$this->Controller->params['action'] = 'Add';
 		$this->assertFalse($this->Controller->Auth->startup($this->Controller));
 	}
+
 /**
  * testLoginRedirect method
  *
@@ -854,6 +855,22 @@ class AuthTest extends CakeTestCase {
 		$this->Controller->Auth->startup($this->Controller);
 		$expected = Router::normalize('posts/index/29?print=true&refer=menu');
 		$this->assertEqual($expected, $this->Controller->Session->read('Auth.redirect'));
+
+		$_GET = array(
+			'url' => '/posts/index/29',
+			'print' => 'true',
+			'refer' => 'menu',
+			'ext' => 'html'
+		);
+		$this->Controller->Session->del('Auth');
+		$url = '/posts/index/29?print=true&refer=menu';
+		$this->Controller->params = Dispatcher::parseParams($url);
+		$this->Controller->Auth->initialize($this->Controller);
+		$this->Controller->Auth->loginAction = array('controller' => 'AuthTest', 'action' => 'login');
+		$this->Controller->Auth->userModel = 'AuthUser';
+		$this->Controller->Auth->startup($this->Controller);
+		$expected = Router::normalize('posts/index/29?print=true&refer=menu');
+		$this->assertEqual($expected, $this->Controller->Session->read('Auth.redirect'));
 		$_GET = $_back;
 
 		//external authed action