If a person forgets the second prostration in the last unit of prayer and concludes the prayer, what does he do when he remembers?

The questioner : Your Eminence, if a person forgets the second prostration after completing the prayer and then remembers that he still has a prostration remaining, what does he do? Does he repeat the prayer?

The Shaykh : Yes, if a person forgets the second prostration in the last unit of prayer and concludes the prayer, and then remembers, we say: return to the prayer, considering that you are now sitting for the supplication between the two prostrations, then perform the second prostration, then conclude the prayer, then perform two prostrations after the conclusion. Yes.