diff --git a/roles/custom/matrix-element-call/defaults/main.yml b/roles/custom/matrix-element-call/defaults/main.yml
index de507b704..1fa2c57d9 100644
--- a/roles/custom/matrix-element-call/defaults/main.yml
+++ b/roles/custom/matrix-element-call/defaults/main.yml
@@ -10,6 +10,7 @@ matrix_element_call_backend_path: "{{ matrix_element_call_base_path }}/backend"
 # Docker network configuration
 matrix_element_call_container_network: "matrix_element_call_network"
 matrix_element_call_container_labels_traefik_additional_response_headers: {}
+matrix_element_call_container_additional_networks: []  # No additional networks by default
 
 # Docker images
 matrix_element_call_image: "ghcr.io/element-hq/element-call:latest"