diff --git a/roles/custom/matrix-client-element/defaults/main.yml b/roles/custom/matrix-client-element/defaults/main.yml
index 39750ab0..f64f302d 100644
--- a/roles/custom/matrix-client-element/defaults/main.yml
+++ b/roles/custom/matrix-client-element/defaults/main.yml
@@ -151,7 +151,7 @@ matrix_client_element_integrations_widgets_urls: ["https://scalar.vector.im/api"
 matrix_client_element_integrations_jitsi_widget_url: "https://scalar.vector.im/api/widgets/jitsi.html"
 matrix_client_element_permalinkPrefix: "https://matrix.to"  # noqa var-naming
 matrix_client_element_bug_report_endpoint_url: "https://element.io/bugreports/submit"
-matrix_client_element_showLabsSettings: true  # noqa var-naming
+matrix_client_element_show_lab_settings: true  # noqa var-naming
 # Element public room directory server(s)
 matrix_client_element_roomdir_servers: ['matrix.org']
 matrix_client_element_welcome_user_id: ~
diff --git a/roles/custom/matrix-client-element/tasks/validate_config.yml b/roles/custom/matrix-client-element/tasks/validate_config.yml
index fdf42df7..50455cae 100644
--- a/roles/custom/matrix-client-element/tasks/validate_config.yml
+++ b/roles/custom/matrix-client-element/tasks/validate_config.yml
@@ -27,6 +27,15 @@
   with_items:
     - {'old': 'matrix_riot_web_.*', 'new': 'matrix_client_element_.*'}
 
+- name: (Deprecation) Catch and report renamed element-web settings
+  ansible.builtin.fail:
+    msg: >-
+      Your configuration contains a variable, which now has a different name.
+      Please change your configuration to rename the variable (`{{ item.old }}` -> `{{ item.new }}`).
+  when: "item.old in vars"
+  with_items:
+    - {'old': 'matrix_client_element_showLabsSettings', 'new': 'matrix_client_element_show_lab_settings'}
+
 - when: matrix_client_element_container_labels_traefik_enabled | bool
   block:
     - name: Fail if required matrix-client-element Traefik settings not defined
diff --git a/roles/custom/matrix-client-element/templates/config.json.j2 b/roles/custom/matrix-client-element/templates/config.json.j2
index c0d11abd..5d510403 100644
--- a/roles/custom/matrix-client-element/templates/config.json.j2
+++ b/roles/custom/matrix-client-element/templates/config.json.j2
@@ -22,7 +22,7 @@
 	"integrations_widgets_urls": {{ matrix_client_element_integrations_widgets_urls | to_json }},
 	"integrations_jitsi_widget_url": {{ matrix_client_element_integrations_jitsi_widget_url | string | to_json }},
 	"bug_report_endpoint_url": {{ matrix_client_element_bug_report_endpoint_url | to_json }},
-	"showLabsSettings": {{ matrix_client_element_showLabsSettings | to_json }},
+	"show_labs_settings": {{ matrix_client_element_show_lab_settings | to_json }},
 	"roomDirectory": {
 		"servers": {{ matrix_client_element_roomdir_servers | to_json }}
 	},