diff --git a/ocaml-bin-prot.spec b/ocaml-bin-prot.spec
index eb835bf..77a0ae0 100644
--- a/ocaml-bin-prot.spec
+++ b/ocaml-bin-prot.spec
@@ -1,3 +1,6 @@
+# OCaml packages not built on i686 since OCaml 5 / Fedora 39.
+ExcludeArch: %{ix86}
+
 Name:           ocaml-bin-prot
 Version:        0.16.0
 Epoch:          1