diff --git a/group_vars/matrix-servers b/group_vars/matrix-servers
index a93467ca..404fc6e3 100755
--- a/group_vars/matrix-servers
+++ b/group_vars/matrix-servers
@@ -90,6 +90,7 @@ matrix_corporal_matrix_registration_shared_secret: "{{ matrix_synapse_registrati
 ######################################################################
 
 matrix_coturn_enabled: true
+matrix_coturn_turn_external_ip_address: "{{ ansible_host }}"
 
 ######################################################################
 #
diff --git a/roles/matrix-coturn/defaults/main.yml b/roles/matrix-coturn/defaults/main.yml
index 5b7dbbe9..d43d4d1c 100644
--- a/roles/matrix-coturn/defaults/main.yml
+++ b/roles/matrix-coturn/defaults/main.yml
@@ -16,7 +16,9 @@ matrix_coturn_turn_static_auth_secret: ""
 matrix_coturn_turn_udp_min_port: 49152
 matrix_coturn_turn_udp_max_port: 49172
 
-matrix_coturn_turn_external_ip_address: "{{ ansible_host }}"
+# The external IP address of the machine where Coturn is.
+matrix_coturn_turn_external_ip_address: ''
+
 matrix_coturn_allowed_peer_ips: []
 matrix_coturn_denied_peer_ips: []
 matrix_coturn_user_quota: null
diff --git a/roles/matrix-coturn/tasks/validate_config.yml b/roles/matrix-coturn/tasks/validate_config.yml
index c62b56d3..39019982 100644
--- a/roles/matrix-coturn/tasks/validate_config.yml
+++ b/roles/matrix-coturn/tasks/validate_config.yml
@@ -6,4 +6,5 @@
       You need to define a required configuration setting (`{{ item }}`) for using Coturn.
   when: "vars[item] == ''"
   with_items:
-    - "matrix_coturn_turn_static_auth_secret"
\ No newline at end of file
+    - "matrix_coturn_turn_external_ip_address"
+    - "matrix_coturn_turn_static_auth_secret"