Mohamed Ali Ben Romdhane, a midfielder with Egyptian and African giants Al Ahly, struck in the 94th minute after being set up by Firas Chaouat.
Emilio Nsue, the captain of unfancied Equatorial Guinea, goes into a last-16 tie with Guinea on Sunday after netting five times in the group stage
Equatorial Guinea pulled off one of the most stunning results in Africa Cup of Nations history on Monday by thrashing hosts Ivory Coast 4-0 to win Group A and secure a last-16 place.
Aguibou Camara's second-half goal gave Guinea a 1-0 win over Gambia at the Africa Cup of Nations on Friday, a result that left them on the brink of securing a place in the last 16.
Victor Osimhen levelled in the first half almost immediately after Iban Edu had opened the scoring for Equatorial Guinea.