[en] The Q² evolution of the charmed structure function (''Intrinsic Charm'') of the proton was considered. It is shown that the numerical results of E. Hoffmann and R. Moore (1983) overestimate the QCD evolution of the heavy quark distribution inside the proton about 2.5 times. This observation leads to result that QCD evolution of the intrinsic charm structure function can in practice be neglected at x_B≥0.1. The main effect comes from the threshold behaviour (''mass corrections'' to the structure function) of the charm distribution. The correct calculations agree better both with the physical expectations and with the experimental data of the EMC collaboration on diffractive charm production in νN-scattering. Fit to the EMC data gives the IC normalization equal to 0.5%. It is concluded that the contribution from neutral current scattering on the intrinsic charmed quark should significantly exceed the contribution from photon-gluon fusion process at small values of the momentum transfer, Q²≤20 GeV² and x_B≥0.1 and can be observed at HERA collider. (orig.)