In a hydraulic cylinder piston unit comprising a cylinder with an interior space delimited by opposite end walls in which a piston and a compensation seal element are movably arranged supported by a piston rod and engaged by a compensation spring disposed between the compensation seal element and an adjacent cylinder end wall, the compensation seal element has two spaced seal rings via which it is guided along the inner cylinder wall and the compensation spring is supported directly on the compensation seal element for an improved sealing effect of the compensation seal element in the extended state of the hydraulic cylinder piston unit and a simplified design.