  We present an evaluation of the background induced by $^{241}$Am-$^{13}$C
neutron calibration sources in the Daya Bay reactor neutrino experiment. As a
significant background for electron-antineutrino detection at 0.26$\pm$0.12 per
detector per day on average, it has been estimated by a Monte Carlo simulation
that was benchmarked by a special calibration data set. This dedicated data set
also provided the energy spectrum of the background.
