diff --git a/pkgs/development/ocaml-modules/tsort/default.nix b/pkgs/development/ocaml-modules/tsort/default.nix
index d47236ba96b..fdfe7a650e5 100644
--- a/pkgs/development/ocaml-modules/tsort/default.nix
+++ b/pkgs/development/ocaml-modules/tsort/default.nix
@@ -2,6 +2,7 @@
 
 buildDunePackage rec {
   pname = "tsort";
+  useDune2 = true;
   version = "2.0.0";
   src = fetchFromGitHub {
     owner = "dmbaturin";