diff --git a/MdePkg/Include/Protocol/NetworkInterfaceIdentifier.h b/MdePkg/Include/Protocol/NetworkInterfaceIdentifier.h
index cebed6e1c1..02b8d1c9e1 100644
--- a/MdePkg/Include/Protocol/NetworkInterfaceIdentifier.h
+++ b/MdePkg/Include/Protocol/NetworkInterfaceIdentifier.h
@@ -64,6 +64,15 @@ struct _EFI_NETWORK_INTERFACE_IDENTIFIER_PROTOCOL {
 
 };
 
+///
+///*******************************************************
+/// EFI_NETWORK_INTERFACE_TYPE
+///*******************************************************
+///
+typedef enum {
+  EfiNetworkInterfaceUndi = 1
+} EFI_NETWORK_INTERFACE_TYPE;
+
 extern EFI_GUID gEfiNetworkInterfaceIdentifierProtocolGuid;
 extern EFI_GUID gEfiNetworkInterfaceIdentifierProtocolGuid_31;