If he is not sure about tawaaf, should he do the prostration of forgetfulness?

If a person is not sure about his tawaaf, should he do the prostration of forgetfulness, given that circumambulation of the Ka‘bah is a form of prayer?.

Praise be to Allah, and blessings and peace be upon the Messenger of Allah:

He should not do this prostration, because prostration is not part of tawaaf. If the act of worship in question does not involve prostration in the first place, how could it be made up, in the case of doubt, by prostrating? End quote.

Majmoo‘ Fatawa Ibn ‘Uthaymeen, 22/347