diff --git a/pkgs/development/ocaml-modules/pratter/default.nix b/pkgs/development/ocaml-modules/pratter/default.nix
index a44e815092c..a2408a267ce 100644
--- a/pkgs/development/ocaml-modules/pratter/default.nix
+++ b/pkgs/development/ocaml-modules/pratter/default.nix
@@ -12,6 +12,7 @@ buildDunePackage rec {
   pname = "pratter";
 
   minimalOCamlVersion = "4.08";
+  duneVersion = "3";
 
   src = fetchFromGitHub {
     owner = "gabrielhdt";