Typically, advancing localised approaches to peacebuilding has evaded critical reflection on the power dynamics and harms that can arise. This paper considers the gender dynamics and gendered harms that can manifest themselves when adopting an uncritical approach to localisation in peacebuilding. To do so, it examines the use of mato oput (drinking the bitter root) in post-conflict northern Uganda, as an example of a localised approach to post-conflict transitional justice, to investigate these dynamics and harms. It draws from interviews and focus-group discussions that were conducted in northern Uganda between 2020 and 2022 and engages with critical international relations scholarship on the 'local turn' in peacebuilding and the gendered nature of conflict and peace. The paper argues that in patriarchal societies, advancing localisation may entail a return to the traditional or customary order that reaffirms and reifies oppressive gender power relations and helps to consolidate gender inequalities, including unequal access to both security and justice.