A side airbag assembly for protecting an occupant of a vehicle seat. The assembly includes an inflatable cushion, wherein the cushion is stored in a compact arrangement. An inflator is provided for supplying inflation gas for the cushion. The inflator and cushion are secured in position by a mounting bracket connected to a frame of the vehicle seat. A cover for covering a back surface of the vehicle seat is included and the cover includes a rear facing surface and a first side facing surface. The cover is connected to the mounting bracket.