Lighting module of a lighting and/or signalling device for a motor vehicle including at least one light source positioned on a source support, an optical element comprising an input face which receives light rays emitted by said at least one light source and is positioned facing the latter, and a frame supporting the optical element and fastened to said source support. The optical element has at least one stud having a free end projecting towards the source support, said at least one stud being made of the same material as the optical element and being in direct or indirect contact with the source support when the lighting module is assembled.