Within the context of the transformation of Turkey from a country of emigration to an immigration and transit country, the migration scene is becoming more heterogeneous, with both the formal and informal labor markets being increasingly internationalized. This paper focuses on de-qualification, defined as migrants taking on jobs that do not match their skills, which is a neglected issue within the migration literature on Turkey with the potential for further research. Based on open-ended interviews and participant observation in İstanbul, the paper elaborates on the different instruments of de-qualification. De-qualification is considered here as an important element of precariousness in the labor market, with different mechanisms functioning simultaneously; namely, accreditation problems, a language disadvantage, lack of information, and identity-based discrimination.