A nacelle of a wind turbine includes a rear frame structure (1), the rear frame structure (1) having a plurality of truss members (2), and a plurality of joints (3), each joint (3) interconnecting ends of at least two truss members (2). Each joint (3) includes a central portion (6) and at least two connecting portions (7) extending away from the central portion (6), each connecting portion (7) being arranged to form an interface towards a truss member (2), and each connecting portion (7) being significantly more flexible than the central portion (6) and significantly more flexible than the truss members (2). The rear frame structure (1) is capable of improved handling of bending moments due to the increased flexibility of the connecting portions (7).