A parking lock for an automatic transmission of a motor vehicle is provided, wherein the automatic transmission has an actuator which can disengage a locking element in the automatic transmission, the locking element is held in a locked position by spring force, and a locking assembly (1) is provided which is connected via an actuating element (2) to the locking element and which has a knee lever (3) which can fix the actuating element (2) so as to prevent engagement of the locking element in the automatic transmission. The invention is characterized in that the knee lever (3) fixes the actuating element (2) in an overextended position, wherein a fixed counter support (4) is attached at the overextended side of the knee lever (3).