PROBLEM TO BE SOLVED: To prevent movement of an overmolded element relative to a frame.SOLUTION: There is provided an optical assembly 100 of a light-emitting module, especially of a lighting and/or signalling module, for a motor vehicle, including an optical element 102 and a frame 101; the optical element 102 being overmolded onto the frame 101, the frame 101 being shaped so as to make a mechanical attachment between the frame 101 and the optical element 102 following the overmolding of the optical element 102 on the frame 101.SELECTED DRAWING: Figure 1
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