diff --git a/pkgs/development/ocaml-modules/bitstring/default.nix b/pkgs/development/ocaml-modules/bitstring/default.nix
index 12ed4ae787d..00546ffba10 100644
--- a/pkgs/development/ocaml-modules/bitstring/default.nix
+++ b/pkgs/development/ocaml-modules/bitstring/default.nix
@@ -4,7 +4,7 @@ buildDunePackage rec {
   pname = "bitstring";
   version = "4.1.0";
 
-  useDune2 = true;
+  duneVersion = "3";
 
   src = fetchFromGitHub {
     owner = "xguerin";
diff --git a/pkgs/development/ocaml-modules/bitstring/ppx.nix b/pkgs/development/ocaml-modules/bitstring/ppx.nix
index 9eb4c74f574..87370ef64b2 100644
--- a/pkgs/development/ocaml-modules/bitstring/ppx.nix
+++ b/pkgs/development/ocaml-modules/bitstring/ppx.nix
@@ -9,7 +9,9 @@ else
 
 buildDunePackage rec {
   pname = "ppx_bitstring";
-  inherit (bitstring) version useDune2 src;
+  inherit (bitstring) version src;
+
+  duneVersion = "3";
 
   buildInputs = [ bitstring ppxlib ];