It has been over a decade since the Employees’ Compensation Act (ECA) came into force, introducing, for the first time under Nigeria's employees’ compensation scheme, mental stress as a basis for compensation. However, legal literature on salient aspects of Nigerian employees’ compensation remains scant. This article seeks to bridge this gap and provide a source of legal scholarship to aid the adjudication of mental stress claims in Nigeria. The article discusses when and how work-related mental stress is compensable within the context of the ECA. It finds that, notwithstanding the subjective nature of mental stress and the possibility of feigning mental injury, the ECA establishes broad bases for compensating mental stress, increasing the risk that employees may manipulate the system and obtain benefits even when mental stress is not work-related. The article therefore articulates criteria to defeat fraudulent claims and ensure that only legitimate mental stress claims are compensated.