Growing rural-to-urban and international migration flows have sparked concerns about the investments in education of the children left behind in Cambodia. We draw on a panel household-level survey conducted in rural villages in 2014 and 2017 to analyze the relationship between parental migration and child schooling. The analysis reveals that children of migrant parents lag significantly behind in terms of completed years of schooling. The longitudinal dimension of the data is used to estimate a placebo test, which greatly reduces the concerns related to the possible confounding effect of unobserved heterogeneity. The negative effect that we uncover appears to be mostly driven by the reduced parental input in children's education rather than by an increase in child work.