A fitting for fastening a cable (2) to a wall (1) is indicated, which comprises a base (6) to be fastened to the wall (1) and a cap (7). The end of the base (6) which in the installed position faces away from the wall has a trough (8) for receiving the cable (2), which in the installed position is closed by the cap (7). The base (6) has three separate faces (9, 10, 11) which form the corners of a triangle for the attachment to the wall (1). The part of the cap (7) which in the installed position is applied against the cable is elastically deformable.