The development of children's lie-telling abilities is considered to be a social and cognitive milestone. While occasional lying is developmentally appropriate, the use of frequent, antisocial lies as a maladaptive problem-solving mechanism can indicate behaviour problems. Since lying is often considered a moral transgression, researchers should examine lying from the perspective of moral theory to understand children's reasons for lying, which may help to understand how chronic lying develops. A theoretical framework, namely the social cognitive process of moral disengagement (MD) could not only provide new insight into children's justifications for telling common lies, but also atypical, antisocial lies. This paper aims to describe how MD may be applied to explain children's justifications for lying, especially antisocial lies, and how adults can address MD by modelling the positive consequences of truth-telling, to promote honesty in children.