The invention relates to a system composed of a sill panel and a fastening clip for fastening the sill panel to a body part of a vehicle, wherein the sill panel has a latching hook, and wherein the fastening clip has a latching receptacle for receiving the latching hook and holding means for retention on the body part, wherein the latching receptacle also has an elastic holding arm which, with the latching hook of the sill panel received in the latching receptacle, exerts, on account of its spring preloading, a holding force on the latching hook which counteracts a release of the sill panel from the fastening clip, wherein, for demounting purposes, the sill panel can be released from the fastening clip by exerting a tensile force which counteracts the holding force of the elastic holding arm.