The object of the invention is to provide simple and cost-effective, internal rupture protection for the axial turbine of an exhaust-gas turbocharger. At the same time, the functional reliability of the exhaust-gas turbocharger is to be increased. According to the invention, this is achieved in that the rupture-protection ring (8) is designed as an integral, essentially radially extending, part of the gas-inlet-side wall (5) of the gas-outlet casing (2) and is connected to the gas-inlet casing (1) either directly or via an axial extension piece (6) arranged upstream.