Do symbolic aspects of integration policies affect migrants’ integration into the host society? In this paper, we study the effects of a symbolic change in birthright citizenship rules in France that requires second-generation immigrants to state their allegiance on their integration. Adopting a Difference-in-Differences approach, we show that, contrary to its stated aim of fostering a greater sense of belonging, this policy led to a loss of national identity and an increase in perceptions of discrimination among the target group. We document that these effects are not driven by changes in naturalization rates or an increased general hostility. We also show that while the reform did not affect their economic or political integration, it did reduce their cultural integration, as measured by religiosity and naming patterns. Overall, rather than promoting integration, such migration policies can lead to a backlash.