Do integration policies that require migrants to demonstrate allegiance lead to more or less integration into the host society? In this paper, we study the effects of a symbolic change in birthright citizenship rules in France on the integration of second-generation immigrants. We exploit an exogenous reform that required second-generation immigrants to declare their willingness to become French as a condition to naturalize. Adopting a Difference-in-Differences approach, we show that, contrary to its stated aim of fostering a greater sense of belonging, this symbolic 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. Overall, rather than promoting integration, such migration policies can lead to a backlash.