diff --git a/pkgs/development/ocaml-modules/unstrctrd/default.nix b/pkgs/development/ocaml-modules/unstrctrd/default.nix
index 104cabfd0fa..f9e287e2162 100644
--- a/pkgs/development/ocaml-modules/unstrctrd/default.nix
+++ b/pkgs/development/ocaml-modules/unstrctrd/default.nix
@@ -21,7 +21,7 @@ buildDunePackage rec {
     sha256 = "0mjm4v7kk75iwwsfnpmxc3bsl8aisz53y7z21sykdp60f4rxnah7";
   };
 
-  useDune2 = true;
+  duneVersion = "3";
 
   propagatedBuildInputs = [
     angstrom