A module for an airbag for helping to protect an occupant of a vehicle having a roof and an interior with a seat for the occupant includes a housing positioned in the roof. The housing includes a wall with openings extending therethrough. The wall defines an interior space for receiving the airbag. A door includes projections extending into the openings for securing the door to the housing and closing the interior space. The door includes a weakened portion that ruptures in response to inflation of the airbag for allowing the airbag to deploy into the cabin. A door closes the interior space and includes a weakened portion that ruptures in response to inflation of the airbag for allowing the airbag to deploy into the cabin. Fasteners are connected to the door and extend into the openings for securing the door to the housing.