This paper investigates the labor market effect of international migration on child work in countries of origin. We use an original cross-country survey dataset, which combines information on international migration with detailed individual-level data on child labor at age 5-14 in a wide range of developing countries. By exploiting both within- and cross-country variation and controlling for country fixed effects, we find a strong empirical regularity about the role of international mobility of workers in reducing child labor in disadvantaged households through changes in the local labor market.