diff --git a/ocaml-lwt.spec b/ocaml-lwt.spec
index 6ef7473..c37b834 100644
--- a/ocaml-lwt.spec
+++ b/ocaml-lwt.spec
@@ -1,3 +1,6 @@
+# OCaml packages not built on i686 since OCaml 5 / Fedora 39.
+ExcludeArch: %{ix86}
+
 Name:           ocaml-lwt
 Version:        5.6.1
 Release:        9%{?dist}