Matchit plugin doesn't match square brackets

When using the matchit plugin I can't get the matching to work on
square brackets, unless I use the :MatchDebug command, then they work
fine.
Everything else is working as far as I can tell, and b:match_words includes [:]

Tested both on vim 7.2 and 7.3 (same config and plugins, two different
debian systems).

What could be causing this?

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