diff --git a/specification/cost-management/resource-manager/Microsoft.CostManagement/stable/2020-06-01/costmanagement.json b/specification/cost-management/resource-manager/Microsoft.CostManagement/stable/2020-06-01/costmanagement.json
index 3f944e7603ef..59d15ecc3802 100644
--- a/specification/cost-management/resource-manager/Microsoft.CostManagement/stable/2020-06-01/costmanagement.json
+++ b/specification/cost-management/resource-manager/Microsoft.CostManagement/stable/2020-06-01/costmanagement.json
@@ -1567,6 +1567,7 @@
     },
     "ErrorDetails": {
       "description": "The details of the error.",
+      "type": "object",
       "properties": {
         "code": {
           "description": "Error code.",