diff --git a/pkgs/development/ocaml-modules/asn1-combinators/default.nix b/pkgs/development/ocaml-modules/asn1-combinators/default.nix
index 3c8be666b66..8447c25cd70 100644
--- a/pkgs/development/ocaml-modules/asn1-combinators/default.nix
+++ b/pkgs/development/ocaml-modules/asn1-combinators/default.nix
@@ -3,13 +3,11 @@
 }:
 
 buildDunePackage rec {
-  minimumOCamlVersion = "4.05";
+  minimalOCamlVersion = "4.08";
 
   pname = "asn1-combinators";
   version = "0.2.6";
 
-  useDune2 = true;
-
   src = fetchurl {
     url = "https://github.com/mirleft/ocaml-asn1-combinators/releases/download/v${version}/asn1-combinators-v${version}.tbz";
     sha256 = "sha256-ASreDYhp72IQY3UsHPjqAm9rxwL+0Q35r1ZojikbGpE=";