diff --git a/pkgs/development/ocaml-modules/uuuu/default.nix b/pkgs/development/ocaml-modules/uuuu/default.nix
index 4473cd8217c0..ed38329ae22b 100644
--- a/pkgs/development/ocaml-modules/uuuu/default.nix
+++ b/pkgs/development/ocaml-modules/uuuu/default.nix
@@ -25,9 +25,11 @@ buildDunePackage rec {
 
   buildInputs = [ angstrom ];
 
-  nativeCheckInputs = [ re ];
+  checkInputs = [ re ];
   doCheck = true;
 
+  duneVersion = "3";
+
   meta = {
     description = "A library to normalize an ISO-8859 input to Unicode code-point";
     homepage = "https://github.com/mirage/uuuu";