diff --git a/package/base-files/files/lib/network/config.sh b/package/base-files/files/lib/network/config.sh
index 76ba324973..a194ab8e24 100755
--- a/package/base-files/files/lib/network/config.sh
+++ b/package/base-files/files/lib/network/config.sh
@@ -237,7 +237,7 @@ setup_interface_static() {
 
 	case "$ip6addr" in
 		*/*) ;;
-		*:*) ip6addr="$ip6addr/128" ;;
+		*:*) ip6addr="$ip6addr/64" ;;
 	esac
 
 	[ -z "$ipaddr" ] || $DEBUG ifconfig "$iface" "$ipaddr" netmask "$netmask" broadcast "${bcast:-+}"