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-rw-r--r--pkgs/development/ocaml-modules/irmin/fs.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/pkgs/development/ocaml-modules/irmin/fs.nix b/pkgs/development/ocaml-modules/irmin/fs.nix
index 1788cf1eda2..4b8d7c4b97a 100644
--- a/pkgs/development/ocaml-modules/irmin/fs.nix
+++ b/pkgs/development/ocaml-modules/irmin/fs.nix
@@ -7,6 +7,7 @@ buildDunePackage rec {
   pname = "irmin-fs";
 
   inherit (irmin) version src strictDeps;
+  duneVersion = "3";
 
   propagatedBuildInputs = [ irmin astring logs lwt ];