FileType event not triggered for make/automake files?

I have an issue where it seems like make and automake file types don't trigger the FileType event.

I have the following line in my ~/.vimrc file:

au FileType config,vim,tex,make,sh,automake set expandtab | set shiftwidth=2 | set softtabstop=2

which correctly sets shiftwidth and softtabstop for all file types config, vim, tex and sh, but doesn't affect files of type make and automake. I don't have any other au commands addressing make and automake separately.

Can someone verify whether this works with your vim? If not, is it a known bug?

VIM - Vi IMproved 7.4 (2013 Aug 10, compiled Jan 2 2014 19:39:47)
Included patches: 1-52
Modified by pkg-vim-maintainers@lists.alioth.debian.org
Compiled by buildd@
Huge version with GTK2-GNOME GUI. Features included (+) or not (-):

.vimrc file can be found online at https://gist.github.com/ShabbyX/3691170

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