Reducing coup risk is imperative and expensive for postconflict leaders. A theoretical framework is therefore needed to explain the subset of leaders who spend on development following civil war. The low-windfall coup-proofing hypothesis proposed here suggests that only postconflict leaders who lack natural resources and offer no strategic importance to donors choose to reduce coup risk by using nonstrategic aid for development. A nested research design with data on postconflict coups (1970–2009) and a case study based on fieldwork are used to test the hypothesis. The hypothesis is supported across robustness checks, indicating that development from aid reduces coup risk for postconflict leaders with low windfall.