diff --git a/pkgs/development/ocaml-modules/ocaml-result/default.nix b/pkgs/development/ocaml-modules/ocaml-result/default.nix
index 2fda6f1440b..15e8f96a484 100644
--- a/pkgs/development/ocaml-modules/ocaml-result/default.nix
+++ b/pkgs/development/ocaml-modules/ocaml-result/default.nix
@@ -1,11 +1,9 @@
 { lib, buildDunePackage, fetchurl, ocaml }:
 
-buildDunePackage rec {
+buildDunePackage (rec {
   pname = "result";
   version = "1.5";
 
-  useDune2 = lib.versionAtLeast ocaml.version "4.08";
-
   src = fetchurl {
     url = "https://github.com/janestreet/result/releases/download/${version}/result-${version}.tbz";
     sha256 = "0cpfp35fdwnv3p30a06wd0py3805qxmq3jmcynjc3x2qhlimwfkw";
@@ -21,4 +19,6 @@ buildDunePackage rec {
     '';
     license = lib.licenses.bsd3;
   };
-}
+} // lib.optionalAttrs (!lib.versionAtLeast ocaml.version "4.08") {
+  duneVersion = "1";
+})