diff --git a/include/rpcdcep.h b/include/rpcdcep.h
index d3c2e096ce5..f2a21964850 100644
--- a/include/rpcdcep.h
+++ b/include/rpcdcep.h
@@ -48,12 +48,21 @@ typedef struct _RPC_MESSAGE
     unsigned long RpcFlags;
 } RPC_MESSAGE, *PRPC_MESSAGE;
 
+#define RPC_CONTEXT_HANDLE_DEFAULT_GUARD ((void *)0xfffff00d)
+
+#define RPC_CONTEXT_HANDLE_DEFAULT_FLAGS    0x00000000
+#define RPC_CONTEXT_HANDLE_FLAGS            0x30000000
+#define RPC_CONTEXT_HANDLE_SERIALIZE        0x10000000
+#define RPC_CONTEXT_HANDLE_DONT_SERIALIZE   0x20000000
+#define RPC_TYPE_STRICT_CONTEXT_HANDLE      0x40000000
+
 #define RPC_NCA_FLAGS_DEFAULT       0x00000000
 #define RPC_NCA_FLAGS_IDEMPOTENT    0x00000001
 #define RPC_NCA_FLAGS_BROADCAST     0x00000002
 #define RPC_NCA_FLAGS_MAYBE         0x00000004
 
 typedef void  (__RPC_STUB *RPC_DISPATCH_FUNCTION)(PRPC_MESSAGE Message);
+typedef RPC_STATUS (RPC_ENTRY *RPC_FORWARD_FUNCTION)(UUID *InterfaceId, RPC_VERSION *InterfaceVersion, UUID *ObjectId, unsigned char *Rpcpro, void **ppDestEndpoint);
 
 typedef struct
 {