diff --git a/src/Symfony/Component/BrowserKit/Tests/CookieJarTest.php b/src/Symfony/Component/BrowserKit/Tests/CookieJarTest.php
index 7ff7e1c153..d744f5209a 100644
--- a/src/Symfony/Component/BrowserKit/Tests/CookieJarTest.php
+++ b/src/Symfony/Component/BrowserKit/Tests/CookieJarTest.php
@@ -94,7 +94,7 @@ class CookieJarTest extends \PHPUnit_Framework_TestCase
         $this->assertEquals('bar', $barCookie->getValue());
         $this->assertEquals('id', $phpCookie->getValue());
         $this->assertEquals($timestamp, $fooCookie->getExpiresTime());
-        $this->assertEquals(null, $barCookie->getExpiresTime());
+        $this->assertNull($barCookie->getExpiresTime());
         $this->assertEquals($timestamp, $phpCookie->getExpiresTime());
     }