This article explores relationships between procedural justice (PJ) in the negotiation process, distributive justice (DJ) in the terms of negotiated agreements, and their durability in cases of civil war. Adherence to PJ principles was found to correlate strongly with agreements based specifically on the DJ principle of equality. Agreements were also found to be more durable when based on equality, but not when based on other DJ principles. The equality principle accounted for the relationship between PJ and durability irrespective of differences between the parties in power. Further examination suggested that two types of equality in particular—equal treatment and equal shares—were associated with forward-looking agreements and high durability. The findings suggest that durability is served by including equality in the terms of agreements, and that PJ helps (but does not guarantee) achieving such agreements.