diff --git a/lib/Cake/Controller/Component/Auth/FormAuthenticate.php b/lib/Cake/Controller/Component/Auth/FormAuthenticate.php
index e37b4a70c..f1079b7ac 100644
--- a/lib/Cake/Controller/Component/Auth/FormAuthenticate.php
+++ b/lib/Cake/Controller/Component/Auth/FormAuthenticate.php
@@ -1,7 +1,5 @@
 <?php
 /**
- *
- *
  * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
  * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
  *
@@ -51,7 +49,7 @@ class FormAuthenticate extends BaseAuthenticate {
 		}
 		foreach (array($fields['username'], $fields['password']) as $field) {
 			$value = $request->data($model . '.' . $field);
-			if (empty($value) && $value !== "0" || !is_string($value)) {
+			if (empty($value) && $value !== '0' || !is_string($value)) {
 				return false;
 			}
 		}
diff --git a/lib/Cake/Test/Case/Controller/Component/Auth/FormAuthenticateTest.php b/lib/Cake/Test/Case/Controller/Component/Auth/FormAuthenticateTest.php
index 90f5797c9..a8a17b2b8 100644
--- a/lib/Cake/Test/Case/Controller/Component/Auth/FormAuthenticateTest.php
+++ b/lib/Cake/Test/Case/Controller/Component/Auth/FormAuthenticateTest.php
@@ -1,7 +1,5 @@
 <?php
 /**
- * FormAuthenticateTest file
- *
  * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
  * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
  *
@@ -166,6 +164,13 @@ class FormAuthenticateTest extends CakeTestCase {
 		));
 		$this->assertFalse($this->auth->authenticate($request, $this->response));
 
+		$request->data = array(
+			'User' => array(
+				'user' => array(),
+				'password' => 'my password'
+		));
+		$this->assertFalse($this->auth->authenticate($request, $this->response));
+
 		$request->data = array(
 			'User' => array(
 				'user' => 'mariano',
@@ -226,6 +231,30 @@ class FormAuthenticateTest extends CakeTestCase {
 		$this->assertFalse($this->auth->authenticate($request, $this->response));
 	}
 
+/**
+ * Test that username of 0 works.
+ *
+ * @return void
+ */
+	public function testAuthenticateUsernameZero() {
+		$User = ClassRegistry::init('User');
+		$User->updateAll(array('user' => $User->getDataSource()->value('0')), array('user' => 'mariano'));
+
+		$request = new CakeRequest('posts/index', false);
+		$request->data = array('User' => array(
+			'user' => '0',
+			'password' => 'password'
+		));
+
+		$expected = array(
+			'id' => 1,
+			'user' => '0',
+			'created' => '2007-03-17 01:16:23',
+			'updated' => '2007-03-17 01:18:31'
+		);
+		$this->assertEquals($expected, $this->auth->authenticate($request, $this->response));
+	}
+
 /**
  * test a model in a plugin.
  *