diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/ContainerDebug/config.yml b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/ContainerDebug/config.yml
index f4a5425808..d00d6f235e 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/ContainerDebug/config.yml
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/ContainerDebug/config.yml
@@ -2,6 +2,7 @@ imports:
     - { resource: ../config/default.yml }
 
 services:
+    _defaults: { public: true }
     public:
         class: Symfony\Bundle\FrameworkBundle\Tests\Fixtures\DeclaredClass
     private_alias: