[plt-scheme] running mzscheme in emacs on debian

I seem to have run into a little problem with running mzscheme in emacs on my debian distro.

mzscheme is in my path, and in the shell comes up with only: mzscheme

This is in my .emacs:(setq scheme-program-name "mzscheme")

But I get a " can't find the program" error when I try to run it.

Any help would be appreciated.

Thanks,

rohan