diff --git a/pkgs/development/tools/ocaml/ocaml-top/default.nix b/pkgs/development/tools/ocaml/ocaml-top/default.nix
index a9b4218224e..6c70b046cab 100644
--- a/pkgs/development/tools/ocaml/ocaml-top/default.nix
+++ b/pkgs/development/tools/ocaml/ocaml-top/default.nix
@@ -4,6 +4,8 @@ with ocamlPackages; buildDunePackage rec {
   pname = "ocaml-top";
   version = "1.2.0-rc";
 
+  useDune2 = true;
+
   src = fetchzip {
     url = "https://github.com/OCamlPro/ocaml-top/archive/${version}.tar.gz";
     sha256 = "1r290m9vvr25lgaanivz05h0kf4fd3h5j61wj4hpp669zffcyyb5";