Dash in output file ignored

I use the following pattern for output file format, ripping CDs to MP3:

{albumArtist}/{albumDate} {albumTitle}/{trackNumber}. {trackArtist} - {trackTitle}

However, the dash and one space between trackArtist and trackTitle is ignored. An output file then looks like this:

01. Nirvana Smells Like Teen Spirit

instead of

01. Nirvana - Smells Like Teen Spirit

which is what I expected.

Max 0.9.1 on Snow Leopard