diff --git a/stack.sh b/stack.sh
index 87865dc..f24d96d 100755
--- a/stack.sh
+++ b/stack.sh
@@ -1726,6 +1726,7 @@
 fi
 add_nova_opt "sql_connection=$BASE_SQL_CONN/nova?charset=utf8"
 add_nova_opt "libvirt_type=$LIBVIRT_TYPE"
+add_nova_opt "libvirt_cpu_mode=none"
 add_nova_opt "instance_name_template=${INSTANCE_NAME_PREFIX}%08x"
 # All nova-compute workers need to know the vnc configuration options
 # These settings don't hurt anything if n-xvnc and n-novnc are disabled