[NTG-context] startlines space width

I am having problems with startlines. I'm using space=yes to preserve space characters. This works fine with default ConTeXt lm/cm font. When I use a font I've imported, however, the spaces aren't quite wide enough. I can fix that with \def\normalspace{\char32}, but then I have problems with embedded floats. What do I need to fix so that the default \def\normalspace{ } has the correct width for the current font? Below is an example file that renders fine with lm/cm, but not my font. %\usetypescript [gurulabs] \starttext \setuplines[space=yes] \bgroup\tt\startlines 1 3 5 7 9 11 13 15 2 4 6 8 10 12 14 \stoplines\egroup \stoptext -- Stuart Jansen Guru Labs, L.C.