Swimming's world governing body FINA issued revised results for that event and two others - the 400 freestyle and the men's 400 individual medley - in the wake of the Tunisian's doping disgrace.
Australia's Grant Hackett had been moved up to second, to take what was Mellouli's silver medal, in the 400 freestyle won by Park Tae-hwan of South Korea in Melbourne in March, FINA said on their Web site [www.fina.org].
Mellouli was stripped of his title in the 800 freestyle after the Court of Arbitration for Sport [CAS] in Lausanne annulled all his results and suspended him for 18 months, dating back to Nov. 30 last year.
Mellouli stripped of title
Mellouli tested positive for amphetamines at a meeting in Indiana on that date, after taking a pill to help him revise for exams.
He then went on to become the first Tunisian to win a world long-course swimming title, taking gold in the 800 and silver in the 400 in Melbourne.
Chinese all clean in doping tests
Mellouli could lose title