When it comes to understanding how peacebuilding affects violence-centred masculinities that emerge during civil wars, the literature on gender and post-conflict reconstruction reveals large gaps. To address this shortcoming, the article analyses the way in which security sector reform (SSR) in Liberia has changed institutional practices of masculinity within the Armed Forces of Liberia (AFL) and the Liberian National Police (LNP). Based on interviews conducted during field research in Monrovia in 2017 and the analysis of policy documents, the author shows that, indeed, SSR has contributed to a change of violence-centred masculinities in both institutions. Women are now, to some extent, accepted as part of both organisations. Sometimes they are even regarded as crucial for mission success. Institutionally, citizen orientation has replaced the practice to abuse civilians and, in the case of the AFL, there are now procedures in place that allow for a prosecution of sexual violence. The Liberian case shows that for changes to occur, especially disarmament and demobilisation, vetting, and the development and reinforcement of new institutional cultures via training and legislation are essential.