diff --git a/specification/frontdoor/resource-manager/Microsoft.Network/preview/2018-08-01-preview/frontdoor.json b/specification/frontdoor/resource-manager/Microsoft.Network/preview/2018-08-01-preview/frontdoor.json
index 48ae71f9be9d..dc0c261ba68a 100644
--- a/specification/frontdoor/resource-manager/Microsoft.Network/preview/2018-08-01-preview/frontdoor.json
+++ b/specification/frontdoor/resource-manager/Microsoft.Network/preview/2018-08-01-preview/frontdoor.json
@@ -2482,10 +2482,10 @@
       "in": "path",
       "required": true,
       "type": "string",
-      "x-new-pattern": "^[a-zA-Z0-9]+(-*[a-zA-Z0-9])*$",
-      "pattern": "^[a-zA-Z0-9]+([-a-zA-Z0-9][a-zA-Z0-9])$",
+      "x-new-pattern": "^[a-zA-Z0-9]+([-a-zA-Z0-9]?[a-zA-Z0-9])*$",
+      "pattern": "^[a-zA-Z0-9]+([-a-zA-Z0-9]?[a-zA-Z0-9])*$",
       "minLength": 5,
-      "maxLength": 74,
+      "maxLength": 64,
       "x-ms-parameter-location": "method",
       "description": "Name of the Front Door which is globally unique."
     },