A slide for a vehicle seat, comprising a female rail having at least one vertical side wall, a male rail also having at least one vertical side wall, mounted to slide relative to the female rail, the female rail surrounding the male rail with the vertical side wall of the female rail facing the vertical side wall of the male rail, a position sensor comprising a means for measuring the surrounding magnetic field fixed to the vertical side wall of the male rail by means of a spring member, and arranged between the substantially planar wall of the male rail and the substantially planar wall of the female rail and oriented towards the substantially planar wall of the female rail.