fontsize of dynamik

[Stefan Thomas]

Dear Lilypond-users,
how can I change the fontsize of the "forte" in the below qoted file to 
normal size?

kleiner = \set fontSize = #-3
normal = \unset fontSize
\relative  { \kleiner bes8_\markup {\italic "as fast as possible"}\f b 
bes cis \normal r2 }