diff --git a/specification/network/resource-manager/Microsoft.Network/stable/2020-05-01/expressRoutePort.json b/specification/network/resource-manager/Microsoft.Network/stable/2020-05-01/expressRoutePort.json
index ca0543ecd149..17291bf0607a 100644
--- a/specification/network/resource-manager/Microsoft.Network/stable/2020-05-01/expressRoutePort.json
+++ b/specification/network/resource-manager/Microsoft.Network/stable/2020-05-01/expressRoutePort.json
@@ -638,8 +638,8 @@
           "type": "string",
           "description": "Mac security cipher.",
           "enum": [
-            "gcm-aes-128",
-            "gcm-aes-256"
+            "GcmAes256",
+            "GcmAes128"
           ],
           "x-ms-enum": {
             "name": "ExpressRouteLinkMacSecCipher",