Loustallot became seriously ill and frail in 1790. However, he still managed to publish his last issue of the "Revolutions of Paris" on September 4, 1790, two weeks before his death. His final work was a commentary on the Nancy mutiny. He died on September 19, 1790 at the age of 28. After learning of his death, the Jacobins sent Maximilien Robespierre and Louis Sébastien Mercier as representatives to his funeral. The Jacobin and Cordelier clubs mourned his death for three days.