The present invention relates to a patient interface (10) for delivering a flow of breathable gas to a patient (12), comprising: a sealing portion (22) for sealing an interface between the patient interface (10) and a patient's face when the patient (10) interface is worn by the patient (12)； a detection unit (30) including a displacement sensor (32, 32′) for generating a displacement signal including information on a displacement of the sealing portion (22) with respect to the patient's face relative to an identified reference position of the sealing portion (22) with respect to the patient's face； one or more actuators (36, 36′, 36″) for positioning at least parts of the sealing portion (22) relative to the patient's face； and a control unit (34) that is configured to actuate the one or more actuators (36, 36′, 36″) based on the displacement signal in order to adjust a position of at least parts of the sealing portion (22) with respect to the patient's face during use.
