Motivation is repeatedly found to be a determining factor for achievement in language acquisition at school. Decades of Self-determination theory (SDT) research has shown that students exhibit higher levels of engagement and positive learning behaviours when their basic psychological needs of competence, autonomy and relatedness are satisfied, resulting in intrinsic motivation. This paper explores and juxtaposes the motivational potential of the International Baccalaureate curriculum against the revised GCSE modern foreign language (MFL) curriculum through an SDT lens. A curriculum that is autonomy-supportive rather than autonomy-suppressive allows more opportunities for both students and teachers psychological needs for motivation to be met.