diff --git a/roles/matrix-corporal/templates/config.json.j2 b/roles/matrix-corporal/templates/config.json.j2
index d8d22f664..9b4c74149 100644
--- a/roles/matrix-corporal/templates/config.json.j2
+++ b/roles/matrix-corporal/templates/config.json.j2
@@ -8,7 +8,7 @@
 	},
 
 	"Corporal": {
-		"UserId": "@{{ matrix_corporal_corporal_user_id_local_part }}:{{ matrix_domain }}"
+		"UserID": "@{{ matrix_corporal_corporal_user_id_local_part }}:{{ matrix_domain }}"
 	},
 
 	"Reconciliation": {