diff --git a/ocaml-markup.spec b/ocaml-markup.spec
index ba5fab5..116043e 100644
--- a/ocaml-markup.spec
+++ b/ocaml-markup.spec
@@ -1,3 +1,6 @@
+# OCaml packages not built on i686 since OCaml 5 / Fedora 39.
+ExcludeArch: %{ix86}
+
 %ifnarch %{ocaml_native_compiler}
 %global debug_package %{nil}
 %endif