diff --git a/specification/network/resource-manager/Microsoft.Network/stable/2018-06-01/virtualNetworkGateway.json b/specification/network/resource-manager/Microsoft.Network/stable/2018-06-01/virtualNetworkGateway.json
index 0090657eb163..45042e7a4263 100644
--- a/specification/network/resource-manager/Microsoft.Network/stable/2018-06-01/virtualNetworkGateway.json
+++ b/specification/network/resource-manager/Microsoft.Network/stable/2018-06-01/virtualNetworkGateway.json
@@ -1608,7 +1608,8 @@
             "description": "VPN client protocol enabled for the virtual network gateway.",
             "enum": [
               "IkeV2",
-              "SSTP"
+              "SSTP",
+              "OpenVPN"
             ],
             "x-ms-enum": {
               "name": "VpnClientProtocol",