diff --git a/viirb-2-configure-fully-after-upgrade.sh b/viirb-2-configure-fully-after-upgrade.sh
index ac84a76..093d547 100755
--- a/viirb-2-configure-fully-after-upgrade.sh
+++ b/viirb-2-configure-fully-after-upgrade.sh
@@ -2,7 +2,7 @@
 # 2020-06-13, Nico Schottelius
 # See https://ungleich.ch/u/products/viirb-ipv6-box/
 
-if [ $# -ne 2 ]; then
+if [ $# -lt 2 ]; then
     echo "$0 viirb-ip-address viirb-id [wgprivkey]"
     echo "    viirb-ip-address: where to find the viirb"
     echo "    viirb-id: number in decimal format"