The within invention concerns a crane with a rotating platform that can rotate on a vertical axle, a boom that is connected to the rotating platform and which can luff on a luffing axle, guying connected on the one hand with the boom and on the other hand with a guy support, which can slew on an axle parallel to the luffing axle of the boom and is connected with the rotating platform and/or the boom foot, as well as an adjustment mechanism, in particular adjustment cabling, that serves for the luffing of the boom and which is connected with the guy support. According to the invention, the crane is also characterized by the presence of an angle adjustment mechanism by means of which the angle of the guy support can be adjusted relative to the boom when the boom is raised.