diff --git a/src/Symfony/Component/Security/Core/Role/RoleHierarchy.php b/src/Symfony/Component/Security/Core/Role/RoleHierarchy.php
index a368a447b0e7e..44ccb39b552be 100644
--- a/src/Symfony/Component/Security/Core/Role/RoleHierarchy.php
+++ b/src/Symfony/Component/Security/Core/Role/RoleHierarchy.php
@@ -19,7 +19,7 @@
 class RoleHierarchy implements RoleHierarchyInterface
 {
     private $hierarchy;
-    private $map;
+    protected $map;
 
     /**
      * Constructor.
@@ -56,7 +56,7 @@ public function getReachableRoles(array $roles)
         return $reachableRoles;
     }
 
-    private function buildRoleMap()
+    protected function buildRoleMap()
     {
         $this->map = array();
         foreach ($this->hierarchy as $main => $roles) {