diff --git a/reactos/include/ddk/ntddser.h b/reactos/include/ddk/ntddser.h
index 4e0e14ae5ed..39493ed33ea 100644
--- a/reactos/include/ddk/ntddser.h
+++ b/reactos/include/ddk/ntddser.h
@@ -365,12 +365,12 @@ typedef struct _SERENUM_PORT_DESC {
 	USHORT  Reserved[1];
 } SERENUM_PORT_DESC, *PSERENUM_PORT_DESC;
 
-typedef UCHAR NTAPI
-(*PSERENUM_READPORT)(
+typedef UCHAR
+(NTAPI*PSERENUM_READPORT)(
   PVOID  SerPortAddress);
 
-typedef VOID NTAPI
-(*PSERENUM_WRITEPORT)(
+typedef VOID
+(NTAPI*PSERENUM_WRITEPORT)(
   PVOID  SerPortAddress,
   UCHAR  Value);