An element for retaining a boot on a ski provided to releasably retain one of the ends of a boot by means of a jaw movable laterally on either side of a centered position aligned with a longitudinal and vertical median plane of the retaining element, and a compensating mechanism acting on the jaw or its return mechanism so as to further facilitate its opening, where the compensating mechanism includes two active elements, either of which are biased as a function of the side where the jaw moves with respect to the vertical and longitudinal median plane. The two active elements are asymmetrical with respect to the longitudinal and vertical median plane, such that the compensating mechanism is more or less active depending on the active element biased as a function of the side on which the jaw moves.