The following year he teamed up with Attilio Marinoni to win the Spa 24 Hours race in Belgium, driving an Alfa Romeo. At the end of the season he retired until 1934, when he made a comeback with the Bugatti team. He was soon made head of the competition department and masterminded the company's Le Mans programme. In 1937 he partnered with Jean-Pierre Wimille to win the 24 Hours of Le Mans endurance race. Following that victory, Benoist retired permanently, but continued to run Bugatti's racing department until called up into the French Air Force.