We perform the gauge-fixing of the theory of a chiral 2-form boson in six-d
imensions starting from the action given by Pasti, Sorokin and Tonin. We us
e the Batalin-Vilkovisky formalism, introducing antifields and writing down
an extended action satisfying the classical master equation. Then we gauge
-fix the three local symmetries of the extended action in two different way
s.