diff --git a/ansible/host_vars/stable-large-01.aws-eu-central-1a.nimbus.prater.yml b/ansible/host_vars/stable-large-01.aws-eu-central-1a.nimbus.prater.yml
index 11d0749..8cebe50 100644
--- a/ansible/host_vars/stable-large-01.aws-eu-central-1a.nimbus.prater.yml
+++ b/ansible/host_vars/stable-large-01.aws-eu-central-1a.nimbus.prater.yml
@@ -2,5 +2,9 @@
 # WARNING: Since these are Eth 2 bootnodes we need to keep the keys and IPs unchanged.
 beacon_node_netkey: '{{lookup("bitwarden", "nimbus/netkey", field=hostname)}}'
 
+# Ports cannot change
+beacon_node_discovery_port: 9100
+beacon_node_listening_port: 9100
+
 # Bootnodes should subscribe to all subnets
 beacon_node_subscribe_all: true
diff --git a/ansible/host_vars/stable-large-02.aws-eu-central-1a.nimbus.prater.yml b/ansible/host_vars/stable-large-02.aws-eu-central-1a.nimbus.prater.yml
index 1046862..0a25194 100644
--- a/ansible/host_vars/stable-large-02.aws-eu-central-1a.nimbus.prater.yml
+++ b/ansible/host_vars/stable-large-02.aws-eu-central-1a.nimbus.prater.yml
@@ -1,5 +1,9 @@
 # WARNING: Since these are Eth 2 bootnodes we need to keep the keys and IPs unchanged.
 beacon_node_netkey: '{{lookup("bitwarden", "nimbus/netkey", field=hostname)}}'
 
+# Ports cannot change
+beacon_node_discovery_port: 9100
+beacon_node_listening_port: 9100
+
 # Bootnodes should subscribe to all subnets
 beacon_node_subscribe_all: true