Humanitarian organisations provide invaluable work to improve the lives of individuals impacted by natural and anthropogenic hazards. While humanitarian organisations are highly knowledge intensive, they often fail to manage knowledge effectively. Providing adequate incentives to foster knowledge sharing on a knowledge management system is a challenge for many organisations. It is especially important in the humanitarian context where organisational efficiency leads to saving more lives. We argue that gamification (i.e., the integration of game-like features, such as points or badges in non-game systems) is a viable solution to address the lack of knowledge sharing often encountered. To do so, we embark on a design science journey with Doctors Without Borders to investigate how gamification within (e.g., using a personal profile) and outside (e.g., using a connected ambient object) a knowledge management system can improve knowledge sharing. Our findings demonstrate that well-designed gamification can increase engagement and knowledge sharing, in particular for altruistic individuals.