An adjustable steering column for a motor vehicle includes a casing unit that rotatably supports a steering shaft, first and second lateral flanges, which can be fastened to the body and between which the casing unit is arranged, a locking device that comprises a clamping bolt, which penetrates the lateral flanges through openings and which is moved in the axial direction when the locking device is opened and closed, and first and second locking elements, between which the casing unit is arranged. The first locking element interacts with a first mating locking element in the closed state of the locking device, and the second locking element interacts with a second mating locking element in the closed state of the locking device. A stop element is arranged on or against the clamping bolt in the area between the two lateral flanges, said stop element being at a distance from a counter-stop in the closed state of the locking device.