diff --git a/pkgs/development/ocaml-modules/secp256k1/default.nix b/pkgs/development/ocaml-modules/secp256k1/default.nix
index 00233beefd9..73a48f9c4de 100644
--- a/pkgs/development/ocaml-modules/secp256k1/default.nix
+++ b/pkgs/development/ocaml-modules/secp256k1/default.nix
@@ -4,6 +4,8 @@ buildDunePackage rec {
   pname = "secp256k1";
   version = "0.4.4";
 
+  duneVersion = "3";
+
   src = fetchFromGitHub {
     owner = "dakk";
     repo = "secp256k1-ml";