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-rw-r--r--pkgs/development/ocaml-modules/irmin/http.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/pkgs/development/ocaml-modules/irmin/http.nix b/pkgs/development/ocaml-modules/irmin/http.nix
index 1f58daca536af..9a466928c64a2 100644
--- a/pkgs/development/ocaml-modules/irmin/http.nix
+++ b/pkgs/development/ocaml-modules/irmin/http.nix
@@ -9,6 +9,7 @@ buildDunePackage rec {
   pname = "irmin-http";
 
   inherit (irmin) version src strictDeps;
+  duneVersion = "3";
 
 
   propagatedBuildInputs = [ astring cohttp-lwt cohttp-lwt-unix fmt jsonm logs lwt uri irmin webmachine ];