diff --git a/pkgs/development/ocaml-modules/duff/default.nix b/pkgs/development/ocaml-modules/duff/default.nix
index 1c6b59961ef2..8c9dad42fd7a 100644
--- a/pkgs/development/ocaml-modules/duff/default.nix
+++ b/pkgs/development/ocaml-modules/duff/default.nix
@@ -7,6 +7,9 @@
 buildDunePackage rec {
   pname = "duff";
   version = "0.2";
+
+  useDune2 = true;
+
   src = fetchurl {
     url = "https://github.com/mirage/duff/releases/download/v${version}/duff-v${version}.tbz";
     sha256 = "0bi081w4349cqc1n9jsjh1lrcqlnv3nycmvh9fniscv8lz1c0gjq";