An especially failsafe method for operating an electric window lift for closing and opening a window of a convertible is provided. A threshold value that is relevant to the triggering of an anti-pinch protection system of the window lift is regularly adapted to the actuation-position-dependent behavior of a sensed operating quantity of the window lift, at least in a lower region of the actuation path of the window, both when the top of the convertible is closed and when it is open. At least for the first window closing process after a closing of the top, the threshold value is rigidly predefined in an upper region of the actuation path of the window.