The invention relates to a locking system, in particular motor vehicle door lock, with at least one lever (1), and with a position-securing unit (5, 6, 7, 8) for the lever (1), wherein the position-securing unit (5, 6, 7, 8) has at least one spring element (5) and is designed for defining at least one stable position (E) of the lever (1), wherein the spring element (5) reaches through the lever (1) in the region of an opening (8), and wherein the opening (8) permits pivoting movements of the lever (1) in relation to the spring element (5) within a predetermined pivoting angle range (9).