diff --git a/roles/custom/matrix-base/templates/static-files/well-known/matrix-client.j2 b/roles/custom/matrix-base/templates/static-files/well-known/matrix-client.j2
index 45c3ea2a..e3a3172e 100644
--- a/roles/custom/matrix-base/templates/static-files/well-known/matrix-client.j2
+++ b/roles/custom/matrix-base/templates/static-files/well-known/matrix-client.j2
@@ -20,10 +20,10 @@
 	{% endif %}
 	{% if matrix_client_element_jitsi_preferredDomain %},
 	"io.element.jitsi": {
-		"preferredDomain": {{ matrix_client_element_jitsi_preferredDomain|to_json }}
+		"preferred_domain": {{ matrix_client_element_jitsi_preferredDomain|to_json }}
 	},
 	"im.vector.riot.jitsi": {
-		"preferredDomain": {{ matrix_client_element_jitsi_preferredDomain|to_json }}
+		"preferred_domain": {{ matrix_client_element_jitsi_preferredDomain|to_json }}
 	}
 	{% endif %}
 	{% if matrix_sliding_sync_enabled %},
diff --git a/roles/custom/matrix-client-element/templates/config.json.j2 b/roles/custom/matrix-client-element/templates/config.json.j2
index 6f2498fd..c0d11abd 100644
--- a/roles/custom/matrix-client-element/templates/config.json.j2
+++ b/roles/custom/matrix-client-element/templates/config.json.j2
@@ -35,7 +35,7 @@
 	},
 	{% if matrix_client_element_jitsi_preferredDomain %}
 	"jitsi": {
-        "preferredDomain": {{ matrix_client_element_jitsi_preferredDomain | to_json }}
+        "preferred_domain": {{ matrix_client_element_jitsi_preferredDomain | to_json }}
     },
 	{% endif %}
 	{% if matrix_client_element_location_sharing_enabled %}