Steering column lock for a motor vehicle

Anti-theft device (1) for a motor vehicle steering column comprising: - a bolt (2) movable between a locking position in which the bolt (2) comes to block the steering column and an unlocking position in which said bolt leaves the steering column free to rotate, - a lock (3), - a cam (4) driven in rotation about an axis of rotation (20) by means of the lock (3) and configured to drive the bolt (2) in movement in the locking and unlocking positions, and - a blocking element (40) disposed at the end (22) of the cam (4) facing the bolt (2) so as to block the bolt (2) in the locking position and to allow the displacement of said bolt (2) out of the locking position of the bolt, said blocking element (40) being movable in rotation about an axis (41) collinear with the axis of rotation (20) of the cam (4).