diff --git a/ocaml-calendar.spec b/ocaml-calendar.spec
index 4f00fa3..980eed5 100644
--- a/ocaml-calendar.spec
+++ b/ocaml-calendar.spec
@@ -1,3 +1,6 @@
+# OCaml packages not built on i686 since OCaml 5 / Fedora 39.
+ExcludeArch: %{ix86}
+
 %undefine _package_note_flags
 %global debug_package %{nil}