diff --git a/pkgs/development/ocaml-modules/mustache/default.nix b/pkgs/development/ocaml-modules/mustache/default.nix
index 5d4b39b21aa..ce2201c3787 100644
--- a/pkgs/development/ocaml-modules/mustache/default.nix
+++ b/pkgs/development/ocaml-modules/mustache/default.nix
@@ -3,7 +3,7 @@
 buildDunePackage rec {
   pname = "mustache";
   version = "3.1.0";
-  useDune2 = true;
+  duneVersion = "3";
   src = fetchFromGitHub {
     owner = "rgrinberg";
     repo = "ocaml-mustache";