A device for adjusting a window pane displaced by a double stranded cable window lifter comprises two cable turning devices arranged at the front and rear, relative to the driving direction of the vehicle along the adjusting direction of the window pane, and a cable, driven by the drive unit, which runs between the cable turning devices along the adjusting direction of the window pane in the two crossed bowden cables. Said cables are at least partly arranged in bowden sheaths, the length of which can be adjusted relative and opposed to each other by means of an adjustment device for altering the lengths of the bowden sheaths, which is arranged in the crossing region of the crossing bowden cables. The length of the bowden sheaths on the drive side bowden cable are changed inversely to the length of the bowden sheath on the non-driven bowden cable.