The film was produced for €6.14 million through Les Films du Trésor in co-production with Arte France Cinéma and Mars Films. The production received pre-sales investment from Canal+ and CinéCinéma. Maïwenn only wanted to cast actors who would be credible in the roles of policemen: "In my opinion all of them had to have a common feature - they had to look like working class people and speak in vernacular Parisian French." Two former members of the CPU were hired to train the actors.