diff --git a/cake/libs/controller/components/auth.php b/cake/libs/controller/components/auth.php
index 135b532df..04b8a6ae2 100644
--- a/cake/libs/controller/components/auth.php
+++ b/cake/libs/controller/components/auth.php
@@ -265,7 +265,7 @@ class AuthComponent extends Object {
 		$isErrorOrTests = (
 			strtolower($controller->name) == 'cakeerror' ||
 			(strtolower($controller->name) == 'tests' && Configure::read() > 0) ||
-			!in_array($controller->params['action'], $controller->methods)
+			!in_array(strtolower($controller->params['action']), $controller->methods)
 		);
 		if ($isErrorOrTests) {
 			return true;
diff --git a/cake/tests/cases/libs/controller/components/auth.test.php b/cake/tests/cases/libs/controller/components/auth.test.php
index 8388495a2..e53f7c7da 100644
--- a/cake/tests/cases/libs/controller/components/auth.test.php
+++ b/cake/tests/cases/libs/controller/components/auth.test.php
@@ -651,6 +651,9 @@ class AuthTest extends CakeTestCase {
 
 		$this->Controller->params['action'] = 'add';
 		$this->assertFalse($this->Controller->Auth->startup($this->Controller));
+
+		$this->Controller->params['action'] = 'Add';
+		$this->assertFalse($this->Controller->Auth->startup($this->Controller));
 	}
 /**
  * testLoginRedirect method