A gas pressure spring comprising a housing having a gas-filled interior, a longitudinal axis, a closed housing end and an open housing end which is situated opposite the closed housing end. The gas pressure spring additionally includes a piston rod which is displaceable along the longitudinal axis and is guided out of the housing in a sealed manner through the open housing end, a piston unit which is fastened on the piston rod and a damping unit for damping the displacement of the piston unit.