A new case is described here of a wound caused by a flint arrowhead in the neolithic period. The specimen comes from a collective burial excavated last century in the cave Trou Rosette (Belgium). It consists of a fragment of left adult ilium. The fragment of arrowhead is located in a rounded cavity which is open in the medial surface of the bone. The CT scan and the artefact study allow us to reconstruct the scenario of the accident. The arrow pierced the musculus gluteus of the individual prior fixing in the iliac blade. The arrow tip broke at the moment of impact; its tang broke either at the moment of impact or during attempts to extract the arrow.