gnuplot set key at position and later move -

in gnuplot i'm trying set key @ specific position few plots, , later want in bottom right corner of screen. tried:

set key @ -5, 5 plot x set key bottom right replot 

but key doesn't move bottom right. how make gnuplot forget set specific key location?

it seems problem if use set key at

i got round adding set key default before set key bottom right

set key @ -5, 5 plot x set key default set key bottom right replot