Toulouse secured their 16th successive season in the French top flight courtesy of Jimmy Durmaz's 88th minute goal which ended the Ligue 1 dream of Ajaccio, the team that finished third in the second division.
That gave Toulouse a 4-0 aggregate win after their 3-0 success in the first leg last week.
That game was played out at an empty stadium in Montpellier.
It should have been staged at Ajaccio's own Francois-Coty stadium but French league officials switched it to a neutral venue and behind closed doors as the Corsican club were punished for the violent scenes which plagued their Ligue 2 play-off against Le Havre.