diff --git a/src/Symfony/Component/HttpFoundation/Session/SessionInterface.php b/src/Symfony/Component/HttpFoundation/Session/SessionInterface.php
index d3fcd2eec4e73..446e4e259ad09 100644
--- a/src/Symfony/Component/HttpFoundation/Session/SessionInterface.php
+++ b/src/Symfony/Component/HttpFoundation/Session/SessionInterface.php
@@ -12,6 +12,7 @@
 namespace Symfony\Component\HttpFoundation\Session;
 
 use Symfony\Component\HttpFoundation\Session\Storage\MetadataBag;
+use Symfony\Component\HttpFoundation\Session\Flash\FlashBagInterface;
 
 /**
  * Interface for the session.
@@ -173,6 +174,13 @@ public function registerBag(SessionBagInterface $bag);
      */
     public function getBag($name);
 
+    /**
+     * Gets the flashbag interface.
+     *
+     * @return FlashBagInterface
+     */
+    public function getFlashBag();
+
     /**
      * Gets session meta.
      *