diff --git a/pkgs/development/ocaml-modules/lambdasoup/default.nix b/pkgs/development/ocaml-modules/lambdasoup/default.nix
index f535ee78fef..2a1ae3fb8a9 100644
--- a/pkgs/development/ocaml-modules/lambdasoup/default.nix
+++ b/pkgs/development/ocaml-modules/lambdasoup/default.nix
@@ -4,6 +4,8 @@ buildDunePackage rec {
   pname = "lambdasoup";
   version = "0.7.1";
 
+  useDune2 = true;
+
   src = fetchFromGitHub {
     owner = "aantron";
     repo = pname;