An adjustment device for a lock of a front hood of a motor vehicle, with the front hood being movable from a normal position to an elevated position, includes a guide and a carriage which is coupled with the lock and movable along the guide. At least one wedge is configured to clamp the carriage with the guide in a clamping position. An actuating mechanism is provided to allow movement of the carriage from the clamping position to an unclamped position by displacing the at least one wedge.