Removing \Noselect flag on a folder?

[Mathew Hennessy]

Hi,
    I've got a folder that I want to wipe, but it's got a \Noselect flag 
and my attempts at removal are thwarted :/

==== CUT ====
$ /usr/cyrus/bin/reconstruct -r user.foo
user.foo
user.foo.Calendar
user.foo.Contacts
user.foo.Deleted Items
user.foo.Deleted Items.Calendar11
user.foo.Drafts
user.foo.Journal
user.foo.Notes
user.foo.Outbox
user.foo.Sent Items
user.foo.Tasks

$ cyradm localhost
IMAP Password:
localhost.localdomain> lm user.foo.*
user.foo.Calendar (\HasNoChildren)
user.foo.Contacts (\HasNoChildren)
user.foo.Deleted Items (\HasChildren)
user.foo.Deleted Items.Calendar11 (\Noselect \HasNoChildren)
user.foo.Drafts (\HasNoChildren)
user.foo.Journal (\HasNoChildren)
user.foo.Notes (\HasNoChildren)
user.foo.Outbox (\HasNoChildren)
user.foo.Sent Items (\HasNoChildren)
user.foo.Tasks (\HasNoChildren)

localhost.localdomain> dm user.foo.Deleted\ Items.Calendar11
deletemailbox: Mailbox is currently reserved
==== CUT ====

    So, how do I get rid of this mailbox?

Cheers,
- Matt