diff --git a/src/Symfony/Component/HttpKernel/CHANGELOG.md b/src/Symfony/Component/HttpKernel/CHANGELOG.md
index 4d0b6149fd..ed7f6035ac 100644
--- a/src/Symfony/Component/HttpKernel/CHANGELOG.md
+++ b/src/Symfony/Component/HttpKernel/CHANGELOG.md
@@ -5,6 +5,7 @@ CHANGELOG
 -----
 
  * deprecated `Symfony\Component\HttpKernel\EventListener\ErrorsLoggerListener`, use `Symfony\Component\HttpKernel\EventListener\DebugHandlersListener` instead
+ * deprecated unused method `Symfony\Component\HttpKernel\Kernel::isClassInActiveBundle` and `Symfony\Component\HttpKernel\KernelInterface::isClassInActiveBundle`
 
 2.5.0
 -----
diff --git a/src/Symfony/Component/HttpKernel/Kernel.php b/src/Symfony/Component/HttpKernel/Kernel.php
index b5e3744de6..a741ed85e7 100644
--- a/src/Symfony/Component/HttpKernel/Kernel.php
+++ b/src/Symfony/Component/HttpKernel/Kernel.php
@@ -209,6 +209,8 @@ abstract class Kernel implements KernelInterface, TerminableInterface
      * {@inheritdoc}
      *
      * @api
+     *
+     * @deprecated Deprecated since version 2.6, to be removed in 3.0.
      */
     public function isClassInActiveBundle($class)
     {
diff --git a/src/Symfony/Component/HttpKernel/KernelInterface.php b/src/Symfony/Component/HttpKernel/KernelInterface.php
index 922f63180f..e03c1518f3 100644
--- a/src/Symfony/Component/HttpKernel/KernelInterface.php
+++ b/src/Symfony/Component/HttpKernel/KernelInterface.php
@@ -77,6 +77,8 @@ interface KernelInterface extends HttpKernelInterface, \Serializable
      * @return bool    true if the class belongs to an active bundle, false otherwise
      *
      * @api
+     *
+     * @deprecated Deprecated since version 2.6, to be removed in 3.0.
      */
     public function isClassInActiveBundle($class);