Abstract: A mechanism for adjusting the inclination of a motor vehicle seat, said mechanism comprising: a first cheek plate and a second cheek plate, said second cheek plate being mounted to pivot on the first cheek plate; a locking device for preventing the first cheek plate from pivoting relative to the second cheek plate, said locking device comprising a first locking element coupled to the first cheek plate, and a second locking element mounted to move on the second cheek plate between an active position and an inactive position; a non-reverse device comprising a cam mounted to pivot between an active position in which said cam comes into contact with the second locking element, and an inactive position; The cam and/or the second locking element is/are provided with teeth.