An exhaust-gas turbocharger (1) having a compressor housing (2) in which a compressor wheel (2′) is arranged; a bearing housing (3); and a turbine housing (4) in which a turbine wheel (4′) is arranged. The axial abutment surfaces (5, 6) are provided between the bearing housing (3) and the turbine housing (4). The axial abutment surfaces (5, 6) have at least one notch (9).