A sensor system for detecting an adjustment position of a vehicle seat, the sensor system having a Hall sensor and a first preloaded magnet, and it is free of flux concentrators and shielding sheets. The Hall sensor and the first preloaded magnet are arranged along a longitudinal extension of the upper rail that is movable lengthwise such that during adjustment of the upper rail, passage of a free longitudinal end of the stationary lower rail will be monitored and result in a change of an output signal of the Hall sensor.