New jail does not understand nullfs

When attempting to start the jail in question the following happens


server# jail -c poudriere
jail: poudriere: unknown parameter: allow.mount.nullfs


Below is my jail.conf

poudriere {
         name=poudriere;
         host.hostname=poudriere;
        ip4.addr="192.168.1.30";
       persist;
        children.max=10;
        allow.mount;
         mount.devfs;
      allow.mount.nullfs;
      allow.raw_sockets;
      allow.socket_af;
      allow.sysvipc;
      enforce_statfs=1;
      path=/newsystem/jail/poudriere;
      exec.stop="umount -a";
}

Does the switch not work yet? As I am using CURRENT with the latest
revision.

-- 
Technological progress is like an ax in the hands of a pathological
criminal.
-*Albert Einstein

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