The French marque's motorsport director hit out at engineers' 'tyre management.'
"They didn't do a very good (job)," he claimed.
"But we are also responsible because we made the choice together."
Title leader Fernando Alonso and teammate Giancarlo Fisichella, though - according to the Gallic 67-year-old - also were to blame.
Dupasquier said: "Better management ... in the first part of the race would have ... helped them."
Renault's Pat Symonds, meanwhile, conceded responsibility, saying the team was simply 'caught out' on the distinctive street circuit.
"It must be something in the way our car is using its tyres," the Englishman admitted.