diff --git a/ocaml-cryptokit.spec b/ocaml-cryptokit.spec
index bd3a6fe..e1c7bda 100644
--- a/ocaml-cryptokit.spec
+++ b/ocaml-cryptokit.spec
@@ -11,6 +11,7 @@ License:        LGPLv2 with exceptions
 URL:            http://pauillac.inria.fr/~xleroy/software.html
 Source0:        http://caml.inria.fr/distrib/bazar-ocaml/cryptokit-%{version}.tar.gz
 BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
+ExcludeArch:    sparc64 s390 s390x
 
 Source1:        cryptokit-META
 
@@ -115,6 +116,10 @@ rm -rf $RPM_BUILD_ROOT
 
 
 %changelog
+* Thu Apr 16 2009 S390x secondary arch maintainer <fedora-s390x@lists.fedoraproject.org>
+- ExcludeArch sparc64, s390, s390x as we don't have OCaml on those archs
+  (added sparc64 per request from the sparc maintainer)
+
 * Wed Feb 25 2009 Fedora Release Engineering <rel-eng@lists.fedoraproject.org> - 1.3-8
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_11_Mass_Rebuild