diff --git a/specification/managementpartner/resource-manager/Microsoft.ManagementPartner/preview/2018-02-01/ManagementPartner.json b/specification/managementpartner/resource-manager/Microsoft.ManagementPartner/preview/2018-02-01/ManagementPartner.json
index 9190bfd7e164..caa080521f40 100644
--- a/specification/managementpartner/resource-manager/Microsoft.ManagementPartner/preview/2018-02-01/ManagementPartner.json
+++ b/specification/managementpartner/resource-manager/Microsoft.ManagementPartner/preview/2018-02-01/ManagementPartner.json
@@ -318,7 +318,11 @@
       "enum": [
         "Active",
         "Deleted"
-      ]
+      ],
+      "x-ms-enum": {
+        "name": "ManagementPartnerState",
+        "modelAsString": true
+      }
     },
     "ErrorResponseCode": {
       "type": "string",