We present a parametrization of the parton densities as derived from the data collected by the CHARM Collaboration in the wide band beam neutrino and antineutrino weak charged-current interactions. They are rescaled to the proton and calculated at a reference Q^2 value of 10 GeV^2 including the next-to-leading order corrections and imposing the Gross-Llewellyn Smith and the momentum sum rules.