The upstream author has been informed about this typo in a mail by Axel Beckert <abe@deuxchevaux.org> to Sean M. Burke <sburke@cpan.org> on Thu, 11 Feb 2010 22:20:48 +0100, but hasn't given any feedback yet (Tue, 16 Feb 2010 19:03:44 +0100), so we patch this using quilt.
