diff --git a/src/Symfony/Component/HttpFoundation/Session/Storage/MockArraySessionStorage.php b/src/Symfony/Component/HttpFoundation/Session/Storage/MockArraySessionStorage.php
index c26cc1334d..c932d4003f 100644
--- a/src/Symfony/Component/HttpFoundation/Session/Storage/MockArraySessionStorage.php
+++ b/src/Symfony/Component/HttpFoundation/Session/Storage/MockArraySessionStorage.php
@@ -58,7 +58,7 @@ class MockArraySessionStorage implements SessionStorageInterface
     protected $metadataBag;
 
     /**
-     * @var array
+     * @var array|SessionBagInterface[]
      */
     protected $bags;