The implementation of democracy in Iraq in 2004 shifted the balance of power between Sunnis and Shias, creating a security dilemma in which the Shia-dominated state struggled to credibly commit to positive future treatment of the newly weakened Shias. I propose that police integration addresses this commitment problem because it gives included groups reason to expect better treatment, and because it is costly for the state to renege on police integration once implemented. I first show that Iraqi Sunnis, who believe the police are integrated interpret service provision as fairer, perceive that their group has better access to government jobs and expect less future repression by the police or the government. These outcomes map onto commonly identified motives for conflict, including horizontal grievances, unemployment, and the commitment problem. I then test the link between integration and support for violence. Using an experiment embedded within the survey, I find that Sunnis exposed to information that the police are integrated are significantly less likely to support anti-state violence.