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-rw-r--r--nixpkgs/pkgs/development/ocaml-modules/optint/default.nix2
1 files changed, 2 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/development/ocaml-modules/optint/default.nix b/nixpkgs/pkgs/development/ocaml-modules/optint/default.nix
index 18e4bd1ae864..7f8ded5feb6c 100644
--- a/nixpkgs/pkgs/development/ocaml-modules/optint/default.nix
+++ b/nixpkgs/pkgs/development/ocaml-modules/optint/default.nix
@@ -9,6 +9,8 @@ buildDunePackage rec {
     sha256 = "1a7gabxqmfvii8qnxq1clx43md2h9glskxhac8y8r0rhzblx3s1a";
   };
 
+  useDune2 = true;
+
   meta = {
     homepage = "https://github.com/mirage/optint";
     description = "Abstract type of integer between x64 and x86 architecture";