diff --git a/vpn/wg-postup.sh b/vpn/wg-postup.sh
index 86af848..74dae9b 100755
--- a/vpn/wg-postup.sh
+++ b/vpn/wg-postup.sh
@@ -8,5 +8,8 @@ PEER_IPV6="$5"
 
 ip addr del "$LOCAL_IP" dev "$IF"
 ip addr add "$LOCAL_IP" peer "$PEER_IP" dev "$IF"
-ip addr del "$LOCAL_IPV6" dev "$IF"
-ip addr add "$LOCAL_IPV6" peer "$PEER_IPV6" dev "$IF"
+
+if [ "$#" -ge 5 ]; then
+	ip addr del "$LOCAL_IPV6" dev "$IF"
+	ip addr add "$LOCAL_IPV6" peer "$PEER_IPV6" dev "$IF"
+fi