Abstract. The social integration of the ever-growing number of refugees in receiving societies is of major importance. Perceived discrimination has been found to predict fewer friendships with natives over time. But what short-term mechanisms explain this effect? In a sample of 115 refugees living in Germany we (i) replicated the long-term discrimination-social-integration relationship, (ii) found short-term associations between discrimination and affective, motivational, and behavioral tendencies not to befriend natives, and (iii) showed authenticity to mediate this short-term relationship: with increasing discrimination, refugees felt less like they could show their authentic selves around natives, which in turn impaired tendencies to befriend natives. Discrimination may impede the formation of interethnic friendships by instilling feelings of inauthenticity. Implications for prevention measures are discussed.