Mapping ctrl-; (ctrl semicolon)

I'm trying to set up a mapping on ctrl-; but vim seems to be unable to
detect the keystroke:

:imap <c-;> blah

Vim seems to read it as a modifier-free semicolon regardless of what I
do. I'm on MacVim snapshot 51 based on Vim 7.2.303. I've tested with
the --noplugin switch and through SSH to a linux 7.0 version. I'm
unaware of any mac shortcuts that would interfere nor any terminal
control characters. I am able to receive the event in other
applications. Searching is somewhat difficult due to the trouble with
search engines indexing ; and there is no mention in the help files.

Is anybody else experiencing this? Is there a workaround?

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