diff --git a/pkgs/development/ocaml-modules/macaddr/cstruct.nix b/pkgs/development/ocaml-modules/macaddr/cstruct.nix
index 991a77a6ba2..14323040892 100644
--- a/pkgs/development/ocaml-modules/macaddr/cstruct.nix
+++ b/pkgs/development/ocaml-modules/macaddr/cstruct.nix
@@ -7,6 +7,8 @@ buildDunePackage {
 
   inherit (macaddr) version src minimumOCamlVersion;
 
+  useDune2 = true;
+
   propagatedBuildInputs = [ macaddr cstruct ];
 
   doCheck = true;
diff --git a/pkgs/development/ocaml-modules/macaddr/sexp.nix b/pkgs/development/ocaml-modules/macaddr/sexp.nix
index 3d0305c4be3..35cc7c6b440 100644
--- a/pkgs/development/ocaml-modules/macaddr/sexp.nix
+++ b/pkgs/development/ocaml-modules/macaddr/sexp.nix
@@ -7,6 +7,8 @@ buildDunePackage {
 
   inherit (macaddr) version src minimumOCamlVersion;
 
+  useDune2 = true;
+
   propagatedBuildInputs = [ ppx_sexp_conv ];
 
   checkInputs = [ macaddr-cstruct ounit ];