  A heat capacity anomaly in the vicinity of magnetic transition was observed
in single crystal GaFeO3 for the first time. The crystals grown along the
expected electric polarization direction were characterized by X-ray
diffraction, M\"ossbauer and magnetic measurements. Two separate data analyses
of heat capacity showed similar results within the experimental accuracy.
Critical exponent, {\alpha}=-0.2(1), and amplitude ratios of positive and
negative reduced temperatures near the critical point, A_+/A_-=1.2(1), are
consistent with behavior of a 3-D Heisenberg ferromagnet.
