Studies of migrant adjustment often conclude that results apply only to remaining migrants. This paper examines the potential bias in using the difference between remaining migrants and natives as a measure of migrant adjustment. The results document that differences between remaining migrants and natives contain bias caused by attrition due to repeat migration. Such bias is small, however, and is unlikely to change migrant-native comparisons. Unless one is concerned with details of differences between migrants and natives, it is unnecessary to be concerned about migration attrition bias in drawing conclusions from the observed differences.