diff --git a/src/Symfony/Bundle/TwigBundle/Resources/config/twig.xml b/src/Symfony/Bundle/TwigBundle/Resources/config/twig.xml
index 2a106d6c3b..06306578e9 100644
--- a/src/Symfony/Bundle/TwigBundle/Resources/config/twig.xml
+++ b/src/Symfony/Bundle/TwigBundle/Resources/config/twig.xml
@@ -88,7 +88,7 @@
             <tag name="twig.extension" />
         </service>
 
-        <service id="twig.extension.httpkernel" class="%twig.extension.httpkernel.class%">
+        <service id="twig.extension.httpkernel" class="%twig.extension.httpkernel.class%" public="false">
             <tag name="twig.extension" />
             <argument type="service" id="http_content_renderer" />
         </service>