A method for performing a Hybrid Automatic Repeat request (HARQ) procedure by a terminal operating in an FDR mode in a wireless communication system comprises the steps of: receiving a downlink signal from a base station; and transmitting feedback information including a NACK signal for the downlink signal to the base station, wherein the feedback information may further include an indicator indicating that the reason for transmitting the NACK signal is that the terminal has failed to remove a self-interference signal.