The establishment of the African Peace and Security Architecture (APSA) marked a fundamental reassessment of the African Union’s (AU) approach to security management. Many studies, however, view APSA through the lens of Eurocentric theories that neglect the agency of African actors. In contrast, this article examines how APSA’s design was influenced by collectively-held emotions – defined as moral judgements, based on present expectations and past experiences – amongst African policymakers. Emotional expressions can stabilise security communities by emphasising enmity towards outsiders and amity between insiders, while demanding remorse from individual or sub-groups of members that commit moral trespasses. However, this article theorises that inward-facing shame, when collectively felt by a community as a whole, can fundamentally alter its norms, valued behaviours and identity. This is illustrated by the APSA case study, which highlights the influence of inward-directed shame amongst African leaders over their reactions to humanitarian catastrophes in the 1990s, as well as outward-directed exasperation at the apathy of the international community. In addition to improving understanding of APSA’s establishment and design, this facilitates theory-building based upon African realities, thus making a valuable contribution to the growing field of International Relations scholarship concerned with emotions.