diff --git a/mono.spec b/mono.spec
index b46bfb4..c94934f 100644
--- a/mono.spec
+++ b/mono.spec
@@ -15,6 +15,8 @@ BuildRequires:  bison, glib2-devel, pkgconfig, libicu-devel libgdiplus
 ExclusiveArch: %ix86 x86_64 ppc ia64 s390 s390x armv4l sparc
 # Buildroots are hosed atm
 ExcludeArch: s390 s390x
+# rpmbuild segfaults
+ExcludeArch: x86-64
 
 %description
 The Mono runtime implements a JIT engine for the ECMA CLI