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-rw-r--r--pkgs/development/ocaml-modules/sedlex/default.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/pkgs/development/ocaml-modules/sedlex/default.nix b/pkgs/development/ocaml-modules/sedlex/default.nix
index 27756fdcd26..0ce962417ed 100644
--- a/pkgs/development/ocaml-modules/sedlex/default.nix
+++ b/pkgs/development/ocaml-modules/sedlex/default.nix
@@ -47,6 +47,7 @@ buildDunePackage rec {
   inherit (param) version;
 
   minimalOCamlVersion = "4.08";
+  duneVersion = "3";
 
   src = fetchFromGitHub {
     owner = "ocaml-community";