diff --git a/pkgs/development/ocaml-modules/happy-eyeballs/default.nix b/pkgs/development/ocaml-modules/happy-eyeballs/default.nix
index b70c6af0f8e..79b1a30d61f 100644
--- a/pkgs/development/ocaml-modules/happy-eyeballs/default.nix
+++ b/pkgs/development/ocaml-modules/happy-eyeballs/default.nix
@@ -7,6 +7,7 @@ buildDunePackage rec {
   version = "0.5.0";
 
   minimalOCamlVersion = "4.08";
+  duneVersion = "3";
 
   src = fetchurl {
     url = "https://github.com/roburio/happy-eyeballs/releases/download/v${version}/happy-eyeballs-${version}.tbz";