diff --git a/pkgs/development/ocaml-modules/mirage-random/default.nix b/pkgs/development/ocaml-modules/mirage-random/default.nix
index a119395764e5..ba70665c6ede 100644
--- a/pkgs/development/ocaml-modules/mirage-random/default.nix
+++ b/pkgs/development/ocaml-modules/mirage-random/default.nix
@@ -4,6 +4,8 @@ buildDunePackage rec {
   pname = "mirage-random";
   version = "3.0.0";
 
+  duneVersion = "3";
+
   src = fetchurl {
     url = "https://github.com/mirage/mirage-random/releases/download/v${version}/mirage-random-v${version}.tbz";
     sha256 = "sha256-Sf4/KB1kMMwXI+yr5H/JuOmynYPNXwlk9dAA+gFAZs8=";