diff --git a/reactos/include/ntos/zwtypes.h b/reactos/include/ntos/zwtypes.h
index f0ce6d51971..0036ad21d6e 100755
--- a/reactos/include/ntos/zwtypes.h
+++ b/reactos/include/ntos/zwtypes.h
@@ -1704,7 +1704,6 @@ typedef struct _LPC_MESSAGE
    ULONG SectionSize; /* CallbackID */
 } LPC_MESSAGE, *PLPC_MESSAGE;
 
-typedef LPC_MESSAGE PORT_MESSAGE, *PPORT_MESSAGE;
 
 #define MAX_MESSAGE_DATA   (0x130)
 
@@ -1714,7 +1713,6 @@ typedef struct _LPC_MAX_MESSAGE
    BYTE Data[MAX_MESSAGE_DATA];
 } LPC_MAX_MESSAGE, *PLPC_MAX_MESSAGE;
 
-typedef LPC_MAX_MESSAGE PORT_MAX_MESSAGE, *PPORT_MAX_MESSAGE;
 
 #define PORT_MESSAGE_TYPE(m) (LPC_TYPE)((m).Header.MessageType)