A device for fastening a light strip to a motor vehicle includes a mounting support and an opening having a first region with a first diameter and a second region arranged so as to be offset in relation to the first region. The second region has a second diameter smaller than the first diameter. The light strip is configured to be mounted on the mounting support in a form-fitting manner. A form-fitting connection between the mounting support and the light strip is established by a T bolt configured to be inserted into the first region and then displaced from the first region into the second region.