diff --git a/pkgs/development/ocaml-modules/mdx/default.nix b/pkgs/development/ocaml-modules/mdx/default.nix
index 75c0ac1e7a98..bf16d88814fd 100644
--- a/pkgs/development/ocaml-modules/mdx/default.nix
+++ b/pkgs/development/ocaml-modules/mdx/default.nix
@@ -15,6 +15,7 @@
   camlp-streams,
   lwt,
   re,
+  result,
   csexp,
   gitUpdater,
 }:
@@ -40,6 +41,7 @@ buildDunePackage rec {
     ocaml-version
     camlp-streams
     re
+    result
     findlib
   ];
   checkInputs = [