A hearing aid device and a method for operating the hearing aid device. The hearing aid device has an acousto-electrical transducer, a signal processing unit, an electro-acoustic transducer and a unit for recognizing a wearer's own voice. The hearing aid device detects and recognizes the wearer's own voice by way of the recognition unit and, when the wearer's own voice has been detected, operates the signal processing unit with a modified signal processing parameter that is modified such that the sound of the wearer's own voice is improved.