diff --git a/pkgs/development/ocaml-modules/ppx_cstubs/default.nix b/pkgs/development/ocaml-modules/ppx_cstubs/default.nix
index 88f187cc706..1b5e96a2d8d 100644
--- a/pkgs/development/ocaml-modules/ppx_cstubs/default.nix
+++ b/pkgs/development/ocaml-modules/ppx_cstubs/default.nix
@@ -18,20 +18,21 @@ buildDunePackage rec {
 
   minimalOCamlVersion = "4.08";
 
-  useDune2 = true;
+  duneVersion = "3";
 
   src = fetchFromGitHub {
     owner = "fdopen";
     repo = "ppx_cstubs";
     rev = version;
-    sha256 = "sha256-qMmwRWCIfNyhCQYPKLiufnb57sTR3P+WInOqtPDywFs=";
+    hash = "sha256-qMmwRWCIfNyhCQYPKLiufnb57sTR3P+WInOqtPDywFs=";
   };
 
-  nativeBuildInputs = [ cppo findlib ];
+  nativeBuildInputs = [ cppo ];
 
   buildInputs = [
     bigarray-compat
     containers
+    findlib
     integers
     num
     ppxlib