  The ALICE experiment measured the heavy-flavour production in the semi-muonic
decay channel at forward rapidities ($2.5<y<4$) in pp and Pb--Pb collisions at
$\sqrt{s_{{NN}}} = 2.76$ TeV. We report on the first results on the $p_{\rm
T}$-differential cross-sections in pp collisions as well as on the nuclear
modification factors as a function of the transverse momentum and centrality.
