The World Federation One Stop Fiqh

Ruling 1205

If after performing ṣalāt al-iḥtiyāṭ one realises that the deficiency in the number of rakʿahs in his prayer was the same as the number of rakʿahs in his ṣalāt al‐iḥtiyāṭ – for example, for the doubt between three and four rakʿahs, he performs one rakʿah of ṣalāt al‐iḥtiyāṭ and later realises that he had performed three rakʿahs – in such a case, his prayer is valid.