diff --git a/mono.spec b/mono.spec
index 469de91..ff390d8 100644
--- a/mono.spec
+++ b/mono.spec
@@ -14,8 +14,9 @@ BuildRequires:  bison, glib2-devel, pkgconfig, libicu-devel libgdiplus
 # JIT only availible on these:
 ExclusiveArch: %ix86 x86_64 ppc ia64 s390 s390x armv4l sparc
 # s390 Buildroots are hosed atm
+ExcludeArch: s390 s390x
 # rpmbuild segfaults on x86-64
-ExcludeArch: s390 s390x x86_64
+ExcludeArch: x86_64
 
 %description
 The Mono runtime implements a JIT engine for the ECMA CLI