  The production of muons from heavy flavour decays is measured at forward
rapidity in proton-proton collisions at $\sqrt{s} = 7$ TeV collected with the
ALICE experiment at the LHC. The analysis is carried out on a data sample
corresponding to an integrated luminosity $L_{\rm int} = 16.5$ nb$^{-1}$. The
transverse momentum and rapidity differential production cross sections of
muons from heavy flavour decays are measured in the rapidity range 2.5 < y < 4,
over the transverse momentum range 2 < $p_{\rm T}$ < 12 GeV/$c$. The results
are compared to predictions based on perturbative QCD calculations.
