The next year Malouet and his wife made a 7-week trip to Paramaribo, to discuss the 200 Maroon that had fled from Surinam to Guiana.
In 1788 he published his Mémoire sur l'esclavage des négres opposing Abbé Raynal, who advocated the abolition of slavery.
On behalf of Saint-Domingue he signed the Whitehall Accord, which placed the colony (along with Guadeloupe and Martinique) under the authority of the British Empire, whilst ensuring the profitability of the sugar plantations by overturning the recent Law of 4 February 1794.
In 1801 his name was erased from the list of émigrés by Napoleon; in 1803, after the Saint-Domingue expedition he was sent to Antwerp as commissioner-general and maritime prefect to supervise the erection of defence works, and the creation of a fleet.
Malouet was the author of a lengthy prose poem with a nautical theme, Les quatre parties du jour à la mer, published in 1783.