diff --git a/include/rpcdce.h b/include/rpcdce.h
index 394b2c0..2510a18 100644
--- a/include/rpcdce.h
+++ b/include/rpcdce.h
@@ -115,6 +115,27 @@
 #define RPC_C_MQ_AUTHN_LEVEL_PKT_INTEGRITY  0x0008
 #define RPC_C_MQ_AUTHN_LEVEL_PKT_PRIVACY    0x0010
 
+#define RPC_C_AUTHN_LEVEL_DEFAULT 0
+#define RPC_C_AUTHN_LEVEL_NONE 1
+#define RPC_C_AUTHN_LEVEL_CONNECT 2
+#define RPC_C_AUTHN_LEVEL_CALL 3
+#define RPC_C_AUTHN_LEVEL_PKT 4
+#define RPC_C_AUTHN_LEVEL_PKT_INTEGRITY 5
+#define RPC_C_AUTHN_LEVEL_PKT_PRIVACY 6
+
+#define RPC_C_AUTHN_NONE 0
+#define RPC_C_AUTHN_DCE_PRIVATE 1
+#define RPC_C_AUTHN_DCE_PUBLIC 2
+#define RPC_C_AUTHN_DEC_PUBLIC 4
+#define RPC_C_AUTHN_GSS_NEGOTIATE 9
+#define RPC_C_AUTHN_WINNT 10
+#define RPC_C_AUTHN_GSS_SCHANNEL 14
+#define RPC_C_AUTHN_GSS_KERBEROS 16
+#define RPC_C_AUTHN_DPA 17
+#define RPC_C_AUTHN_MSN 18
+#define RPC_C_AUTHN_DIGEST 21
+#define RPC_C_AUTHN_MQ 100
+#define RPC_C_AUTHN_DEFAULT 0xffffffff
 
 typedef RPC_STATUS RPC_ENTRY RPC_IF_CALLBACK_FN( RPC_IF_HANDLE InterfaceUuid, void *Context );
 typedef void (__RPC_USER *RPC_AUTH_KEY_RETRIEVAL_FN)();