The invention relates to a prosthesis with a prosthesis socket which has an inner face and is designed to be arranged on an amputation stump after a liner has been pulled over the latter, such that the inner face is directed toward the liner and a volume is enclosed between the inner face and the liner, and with a pump for generating an underpressure in the volume when the prosthesis socket is arranged on the amputation stump, characterized in that the pump is a peristaltic pump (1).
