diff --git a/specification/cost-management/resource-manager/Microsoft.CostManagement/stable/2021-10-01/costmanagement.json b/specification/cost-management/resource-manager/Microsoft.CostManagement/stable/2021-10-01/costmanagement.json
index 1c8e63c20dae..1dc5e0a629d9 100644
--- a/specification/cost-management/resource-manager/Microsoft.CostManagement/stable/2021-10-01/costmanagement.json
+++ b/specification/cost-management/resource-manager/Microsoft.CostManagement/stable/2021-10-01/costmanagement.json
@@ -1768,7 +1768,7 @@
       "type": "object",
       "allOf": [
         {
-          "$ref": "#/definitions/Resource"
+          "$ref": "#/definitions/ProxyResource"
         }
       ],
       "properties": {