2 files changed, 2 insertions, 0 deletions
diff --git a/pkgs/development/ocaml-modules/janestreet/0.14.nix b/pkgs/development/ocaml-modules/janestreet/0.14.nix
index ae3d4d6b624eb..0a93fc6f12e50 100644
--- a/pkgs/development/ocaml-modules/janestreet/0.14.nix
+++ b/pkgs/development/ocaml-modules/janestreet/0.14.nix
@@ -273,6 +273,7 @@ with self;
   };
 
   email_message = janePackage {
+    duneVersion = "3";
     pname = "email_message";
     hash = "0k8hjkq91ikl7wjxs04k523jbkhl6q4abj6v0lzlbjiybmrpp69n";
     meta.description = "E-mail message parser";
diff --git a/pkgs/development/ocaml-modules/janestreet/0.15.nix b/pkgs/development/ocaml-modules/janestreet/0.15.nix
index ed9de3930796c..d03f8cfdcd7d3 100644
--- a/pkgs/development/ocaml-modules/janestreet/0.15.nix
+++ b/pkgs/development/ocaml-modules/janestreet/0.15.nix
@@ -318,6 +318,7 @@ with self;
   };
 
   email_message = janePackage {
+    duneVersion = "3";
     pname = "email_message";
     hash = "00h66l2g5rjaay0hbyqy4v9i866g779miriwv20h9k4mliqdq7in";
     meta.description = "E-mail message parser";