We designed one-and-a-half-barrel vascularized free fibular flap which is a further modification of the double-barrel technique, and we tried to overcome the discrepancy between mandible and fibula flap. We used this flap in case of a segmental mandibular defect that occurred as a result of a giant cell reparative granuloma excision. This new modification eliminated volume insufficiency of the classical technique and volume excess of the double-barrel technique.A segmental mandibular defect that occurred as a result of giant cell reparative granuloma excision was reconstructed using one-and-a-half-barrel vascularized free fibular flap. The size discrepancy between mandible and free fibula flap is a well-known problem, and this new modification of free fibular flap eliminated volume insufficiency or excess problems of the other techniques.