Donor‐led post‐conflict interventions often involve the transfer of anti‐corruption institutions and approaches. However, some question the sustainability of these efforts. This article examines the sustainability of anti‐corruption funding during and after the Regional Assistance Mission to Solomon Islands (RAMSI) intervention (2003–2017), an international peace‐ and state‐building mission. It focuses on allocations for and spending on Solomon Islands anti‐corruption organisations during and after the RAMSI‐led intervention for the period 2010 to 2020. It shows that while political elites have occasionally resisted anti‐corruption reforms, post‐RAMSI governments have maintained levels of funding to key anti‐corruption agencies above that of its nearest neighbour, Papua New Guinea, while passing new anti‐corruption legislation. The article argues that while concerns about corruption remain, political elites have, initially at least, maintained their commitment to anti‐corruption policy transfer in the post‐RAMSI era. The findings have implications for evaluating donor‐led anti‐corruption efforts in Solomon Islands and other post‐conflict situations.