diff --git a/ansible/group_vars/nimbus.prater.yml b/ansible/group_vars/nimbus.prater.yml
index d066f82..359dcb4 100644
--- a/ansible/group_vars/nimbus.prater.yml
+++ b/ansible/group_vars/nimbus.prater.yml
@@ -82,6 +82,7 @@ validator_client_service_enabled: '{{ node.get("validator_client", false) }}'
 validator_client_network: '{{ beacon_node_network }}'
 validator_client_log_level: 'INFO'
 validator_client_beacon_node_url: 'http://127.0.0.1:{{ beacon_node_rest_port }}'
+validator_client_doppelganger_detection: false
 # Builds
 validator_client_build_repo_branch: '{{ beacon_node_repo_branch }}'
 validator_client_build_frequency: 'daily'