Despite a friendly approach towards the restored Bourbons, Debry accepted Napoleon's appointment to the prefecture of Bas-Rhin during the Hundred Days, on 22 March 1815. Following the emperor's second abdication he was dismissed from office, and in January 1816 forced to leave the country by a law that exiled the regicides of Louis XVI. He retired to Mons, in the United Kingdom of the Netherlands. Debry was only allowed to return with the definitive fall of the Bourbons in 1830, and as a former prefect was granted a pension by the new government of Louis Philippe of France. He died in Paris on 6 January 1834.