diff --git a/src/lwt/dune b/src/lwt/dune
index e9a94982..77d0c3c0 100644
--- a/src/lwt/dune
+++ b/src/lwt/dune
@@ -1,6 +1,7 @@
 (library
  (name moonpool_lwt)
  (public_name moonpool-lwt)
+ (optional)
  (enabled_if
   (>= %{ocaml_version} 5.0))
  (modules moonpool_lwt types_)