Broken NS

define("NS_FORUM", 110);
define("NS_FORUM_TALK", 111);
$wgExtraNamespaces[NS_FORUM] = "Forum";
$wgExtraNamespaces[NS_FORUM_TALK] = "Forum_talk";
$wgNamespacesWithSubpages[NS_FORUM] = true;
$wgNamespacesWithSubpages[NS_FORUM_TALK] = true;