 After saluting the Brazilian flag, he requested and received an audience with Emperor Pedro where the damages to be paid to French shipowners were agreed.On his return to France, Roussin was congratulated for solving the problem by diplomacy, and was appointed by King Charles X to the honorary post of Gentleman of the bedchamber.On 25 January 1830 he was elected to the French Academy of Sciences in recognition of his work on geography and navigation.