diff --git a/src/Symfony/Component/Security/Core/Authentication/Token/AbstractToken.php b/src/Symfony/Component/Security/Core/Authentication/Token/AbstractToken.php
index f83b5d9085..6015799855 100644
--- a/src/Symfony/Component/Security/Core/Authentication/Token/AbstractToken.php
+++ b/src/Symfony/Component/Security/Core/Authentication/Token/AbstractToken.php
@@ -230,7 +230,7 @@ abstract class AbstractToken implements TokenInterface
         }
 
         if ($this->user instanceof EquatableInterface) {
-            return !$this->user->isEqualTo($user);
+            return ! (Boolean) $this->user->isEqualTo($user);
         }
 
         if ($this->user->getPassword() !== $user->getPassword()) {
diff --git a/tests/Symfony/Tests/Component/Security/Core/Authentication/Token/AbstractTokenTest.php b/tests/Symfony/Tests/Component/Security/Core/Authentication/Token/AbstractTokenTest.php
index 02a01b4e83..386ddc08ad 100644
--- a/tests/Symfony/Tests/Component/Security/Core/Authentication/Token/AbstractTokenTest.php
+++ b/tests/Symfony/Tests/Component/Security/Core/Authentication/Token/AbstractTokenTest.php
@@ -144,8 +144,10 @@ class AbstractTokenTest extends \PHPUnit_Framework_TestCase
     public function getUsers()
     {
         $user = $this->getMock('Symfony\Component\Security\Core\User\UserInterface');
+        $advancedUser = $this->getMock('Symfony\Component\Security\Core\User\AdvancedUserInterface');
 
         return array(
+            array($advancedUser),
             array($user),
             array(new TestUser('foo')),
             array('foo'),
@@ -171,6 +173,7 @@ class AbstractTokenTest extends \PHPUnit_Framework_TestCase
     public function getUserChanges()
     {
         $user = $this->getMock('Symfony\Component\Security\Core\User\UserInterface');
+        $advancedUser = $this->getMock('Symfony\Component\Security\Core\User\AdvancedUserInterface');
 
         return array(
             array(
@@ -182,12 +185,21 @@ class AbstractTokenTest extends \PHPUnit_Framework_TestCase
             array(
                 'foo', $user,
             ),
+            array(
+                'foo', $advancedUser
+            ),
             array(
                 $user, 'foo'
             ),
+            array(
+                $advancedUser, 'foo'
+            ),
             array(
                 $user, new TestUser('foo'),
             ),
+            array(
+                $advancedUser, new TestUser('foo'),
+            ),
             array(
                 new TestUser('foo'), new TestUser('bar'),
             ),
@@ -197,6 +209,15 @@ class AbstractTokenTest extends \PHPUnit_Framework_TestCase
             array(
                 new TestUser('foo'), $user,
             ),
+            array(
+                new TestUser('foo'), $advancedUser,
+            ),
+            array(
+                $user, $advancedUser
+            ),
+            array(
+                $advancedUser, $user
+            ),
         );
     }