diff --git a/UPGRADE-3.0.md b/UPGRADE-3.0.md
index dba1d48be33c2..288c9754d7a06 100644
--- a/UPGRADE-3.0.md
+++ b/UPGRADE-3.0.md
@@ -758,6 +758,38 @@ UPGRADE FROM 2.x to 3.0
  * The `supportsAttribute()` and `supportsClass()` methods of classes `AuthenticatedVoter`, `ExpressionVoter`
    and `RoleVoter` have been removed.
 
+ * The `AbstractVoter::supports()` method signature have changed: second argument now is object instead of class name.
+
+   Before:
+
+   ```php
+   class MyVoter extends AbstractVoter
+   {
+       protected function supports($attribute, $class)
+       {
+           return 'EDIT' === $attribute && $this->isClassInstanceOf($class, 'Topic');
+       }
+
+       // ...
+   }
+   ```
+
+   After:
+
+   ```php
+   class MyVoter extends AbstractVoter
+   {
+       protected function supports($attribute, $object)
+       {
+           return 'EDIT' === $attribute && $object instanceof Topic;
+       }
+
+       // ...
+   }
+   ```
+
+ * The `isClassInstanceOf()` method of classe `AbstractVoter` have been removed.
+
 ### Translator
 
  * The `Translator::setFallbackLocale()` method has been removed in favor of
diff --git a/src/Symfony/Component/Security/Core/Authorization/Voter/AbstractVoter.php b/src/Symfony/Component/Security/Core/Authorization/Voter/AbstractVoter.php
index 71f570f15e22a..1df12d1927958 100644
--- a/src/Symfony/Component/Security/Core/Authorization/Voter/AbstractVoter.php
+++ b/src/Symfony/Component/Security/Core/Authorization/Voter/AbstractVoter.php
@@ -17,6 +17,7 @@
  * Abstract Voter implementation that reduces boilerplate code required to create a custom Voter.
  *
  * @author Roman Marintšenko <inoryy@gmail.com>
+ * @author Konstantin Myakshin <koc-dp@yandex.ru>
  */
 abstract class AbstractVoter implements VoterInterface
 {
@@ -41,10 +42,9 @@ public function vote(TokenInterface $token, $object, array $attributes)
 
         // abstain vote by default in case none of the attributes are supported
         $vote = self::ACCESS_ABSTAIN;
-        $class = get_class($object);
 
         foreach ($attributes as $attribute) {
-            if (!$this->supports($attribute, $class)) {
+            if (!$this->supports($attribute, $object)) {
                 continue;
             }
 
@@ -61,31 +61,14 @@ public function vote(TokenInterface $token, $object, array $attributes)
     }
 
     /**
-     * Determines if the attribute and class are supported by this voter.
-     *
-     * To determine if the passed class is instance of the supported class, the
-     * isClassInstanceOf() method can be used.
+     * Determines if the attribute and object are supported by this voter.
      *
      * @param string $attribute An attribute
-     * @param string $class     The fully qualified class name of the passed object
+     * @param object $object    The object to secure
      *
-     * @return bool True if the attribute and class is supported, false otherwise
+     * @return bool True if the attribute and object is supported, false otherwise
      */
-    abstract protected function supports($attribute, $class);
-
-    /**
-     * A helper method to test if the actual class is instanceof or equal
-     * to the expected class.
-     *
-     * @param string $actualClass   The actual class name
-     * @param string $expectedClass The expected class name
-     *
-     * @return bool
-     */
-    protected function isClassInstanceOf($actualClass, $expectedClass)
-    {
-        return $expectedClass === $actualClass || is_subclass_of($actualClass, $expectedClass);
-    }
+    abstract protected function supports($attribute, $object);
 
     /**
      * Perform a single access check operation on a given attribute, object and token.
diff --git a/src/Symfony/Component/Security/Core/Tests/Authorization/Voter/AbstractVoterTest.php b/src/Symfony/Component/Security/Core/Tests/Authorization/Voter/AbstractVoterTest.php
index aafef5a7a648d..537dc4c161971 100644
--- a/src/Symfony/Component/Security/Core/Tests/Authorization/Voter/AbstractVoterTest.php
+++ b/src/Symfony/Component/Security/Core/Tests/Authorization/Voter/AbstractVoterTest.php
@@ -63,9 +63,8 @@ protected function voteOnAttribute($attribute, $object, TokenInterface $token)
         return 'EDIT' === $attribute;
     }
 
-    protected function supports($attribute, $class)
+    protected function supports($attribute, $object)
     {
-        return $this->isClassInstanceOf($class, 'stdClass')
-            && in_array($attribute, array('EDIT', 'CREATE'));
+        return $object instanceof \stdClass && in_array($attribute, array('EDIT', 'CREATE'));
     }
 }

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