diff --git a/libguestfs.spec b/libguestfs.spec
index 4997794..f69dd61 100644
--- a/libguestfs.spec
+++ b/libguestfs.spec
@@ -1,3 +1,6 @@
+# OCaml packages not built on i686 since OCaml 5 / Fedora 39.
+ExcludeArch: %{ix86}
+
 # Architectures on which golang works.
 #% global golang_arches aarch64 % {arm} % {ix86} x86_64
 # In theory the above, in practice golang is so often broken that