diff --git a/pkgs/development/ocaml-modules/dtoa/default.nix b/pkgs/development/ocaml-modules/dtoa/default.nix
index 62fa7cd08c8..da075f5c798 100644
--- a/pkgs/development/ocaml-modules/dtoa/default.nix
+++ b/pkgs/development/ocaml-modules/dtoa/default.nix
@@ -4,6 +4,8 @@ buildDunePackage rec {
   pname = "dtoa";
   version = "0.3.2";
 
+  useDune2 = true;
+
   minimumOCamlVersion = "4.02";
 
   src = fetchurl {