  Using the color glass condensate formalism, we study the nuclear modification
of forward $J/\psi$ and $D$ meson production in high energy proton-nucleus
collisions at the LHC. We show that relying on the optical Glauber model to
obtain the dipole cross section of the nucleus from the one of the proton
fitted to HERA DIS data leads to a smaller nuclear suppression than in the
first study of these processes in this formalism and a better agreement with
experimental data.
