line-width in lilypond book

[Stefan Thomas]

Community,
I just noticed that it doesn't seem to make any difference whether I write
 \begin[line-width=394\pt]{lilypond}
or
 \begin[line-width=394\pt]{lilypond}
in a latex file, that I process with lilypond-book.
The lines don't fit the page margins.
Does anyone know what to do here?
Thanks,
Stefan