Heat capacity was measured on fine powder samples of yttria-stabilized cubic zirconia, (ZrO2)(1-x)(Y2O3)(x)(x=0.0776 and 0.0970), between 13 and 300 K by adiabatic calorimetry. A broad hump was observed at about 20 K in the normalized heat capacity curve of C-p*T-3 versus T, in contrast with that of non-doped zirconia (x=0).