The Laves phases GdMn2 has been recently prepared in amorphous structure. We present heat capacity measurements under magnetic fields up to 9T in both polycrystalline and amorphous states. No distinguishable anomaly at the magnetic order temperature is observed in the amorphous sample. In both cases a very low field dependence of the heat capacity is observed. The calculated magnetocaloric effects give rise to a maximum centred at 37 K in the crystalline form and a low, but broad maximum centred at 130 K in the amorphous sample. (C) 2003 Elsevier B.V. All rights reserved.