  We measured the optical reflectivity of the Dirac material Au$_{2}$Pb in a
broad frequency range (30 - 48 000 cm$^{-1}$) for temperatures between 9 and
300 K. The optical conductivity, computed from the reflectivity, is dominated
by free-carrier contributions from topologically trivial bulk bands at all
temperatures. The temperature-independent total plasma frequency of these
carriers is 3.9 $\pm$ 0.2 eV. Overall, optical response of Au$_{2}$Pb is
typically metallic with no signs of localization and bad-metal behavior.
