diff --git a/grafana/install.sh b/grafana/install.sh
index 1d7332f..fe866a4 100644
--- a/grafana/install.sh
+++ b/grafana/install.sh
@@ -1,10 +1,10 @@
 wget -q -O - https://packages.grafana.com/gpg.key | sudo apt-key add -
 echo "deb https://packages.grafana.com/oss/deb stable main" | sudo tee -a /etc/apt/sources.list.d/grafana.list
 apt-get update
-apt-get install -y grafana
+apt-get install -y grafana iptables
 
 cp grafana.ini /etc/grafana/grafana.ini
-iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 3000
+iptables -t nat -I PREROUTING -p tcp --dport 80 -j REDIRECT --to-ports 3000
 
 systemctl daemon-reload
 systemctl enable grafana-server