diff --git a/ocaml-cppo.spec b/ocaml-cppo.spec
index c051646..90c2c3c 100644
--- a/ocaml-cppo.spec
+++ b/ocaml-cppo.spec
@@ -1,3 +1,6 @@
+# OCaml packages not built on i686 since OCaml 5 / Fedora 39.
+ExcludeArch: %{ix86}
+
 Name:           ocaml-cppo
 Version:        1.6.9
 Release:        1%{?dist}