diff --git a/pkgs/development/tools/ocaml/cppo/default.nix b/pkgs/development/tools/ocaml/cppo/default.nix
index 87db3baf0b0e..2f057ada92b9 100644
--- a/pkgs/development/tools/ocaml/cppo/default.nix
+++ b/pkgs/development/tools/ocaml/cppo/default.nix
@@ -23,7 +23,7 @@ buildDunePackage rec {
   inherit pname;
   version = "1.6.9";
 
-  useDune2 = true;
+  duneVersion = "3";
 
   src = fetchFromGitHub {
     owner = "ocaml-community";
diff --git a/pkgs/development/tools/ocaml/cppo/ocamlbuild.nix b/pkgs/development/tools/ocaml/cppo/ocamlbuild.nix
index d0627480ea1c..3f1f436b076c 100644
--- a/pkgs/development/tools/ocaml/cppo/ocamlbuild.nix
+++ b/pkgs/development/tools/ocaml/cppo/ocamlbuild.nix
@@ -4,10 +4,13 @@ if lib.versionOlder (lib.getVersion cppo) "1.6"
 then cppo
 else
 
-buildDunePackage rec {
+buildDunePackage {
   pname = "cppo_ocamlbuild";
 
-  inherit (cppo) version useDune2 src;
+  inherit (cppo) version src;
+
+  minimalOCamlVersion = "4.03";
+  duneVersion = "3";
 
   propagatedBuildInputs = [ ocamlbuild ];