A lighting and/or signaling device for an automobile comprising a xenon lamp and a mating part comprising a reflector and a lamp holder providing the holding of a bulb of the discharge lamp in front of the reflector. A system for fixing the xenon lamp on the mating part comprising a rigid ring able to be mounted, so as to be able to move in rotation, about the lamp holder and a flexible annulus mounted inside the rigid ring and fixed to the lamp holder so as to be non-removable.