diff --git a/files/qemu-ifup-public b/files/qemu-ifup-public
index 0912549..1e79883 100755
--- a/files/qemu-ifup-public
+++ b/files/qemu-ifup-public
@@ -15,7 +15,7 @@ source /etc/libvirt/hooks/$IFACE
 : ${PUBLICMAC:=52:54:00:00:00:11}
 ###
 
-maxprefixv6=64
+maxprefixv6=60
 maxprefixv4=25
 
 if [ -z $IP ]; then