After 1904 Cornet never again had any great success in any race. He abandoned the 1905 Tour de France in the 4th stage. He won the 1906 Paris-Roubaix race, but could not start the 1906 Tour de France, and had to abandon it again in 1907, but did manage 8th place finish in 1908. Extremely fast in what today are called time trials, he won the final leg of the 1908 race. A special timed lap run at a velodrome racetrack in Paris, the event was not counted as an official stage or towards the overall classification. Cornet competed in his last Tour de France in 1912, finishing 28th. 