diff --git a/ports/win32/include/arch/cc.h b/ports/win32/include/arch/cc.h
index e06bd33..7394512 100644
--- a/ports/win32/include/arch/cc.h
+++ b/ports/win32/include/arch/cc.h
@@ -38,6 +38,7 @@
 #include <stdlib.h>
 
 /** @todo fix some warnings */
+#pragma warning (disable: 4127)
 #pragma warning (disable: 4244)
 #pragma warning (disable: 4996)
 
diff --git a/ports/win32/msvc8/lwIP Test.vcproj b/ports/win32/msvc8/lwIP Test.vcproj
index 883e755..bf26766 100644
--- a/ports/win32/msvc8/lwIP Test.vcproj	
+++ b/ports/win32/msvc8/lwIP Test.vcproj	
@@ -143,7 +143,7 @@
 				UsePrecompiledHeader="0"
 				PrecompiledHeaderFile="$(IntDir)/$(TargetName).pch"
 				ProgramDataBaseFileName="$(IntDir)/$(ProjectName).pdb"
-				WarningLevel="3"
+				WarningLevel="4"
 				SuppressStartupBanner="true"
 				DebugInformationFormat="3"
 				CompileAs="0"
diff --git a/ports/win32/msvc8/lwIP pktif.vcproj b/ports/win32/msvc8/lwIP pktif.vcproj
index 63f2881..c954a41 100644
--- a/ports/win32/msvc8/lwIP pktif.vcproj	
+++ b/ports/win32/msvc8/lwIP pktif.vcproj	
@@ -49,7 +49,7 @@
 				StructMemberAlignment="1"
 				UsePrecompiledHeader="0"
 				ProgramDataBaseFileName="$(IntDir)/$(ProjectName).pdb"
-				WarningLevel="3"
+				WarningLevel="4"
 				SuppressStartupBanner="true"
 				DebugInformationFormat="3"
 				CompileAs="0"
diff --git a/ports/win32/msvc8/lwIP.vcproj b/ports/win32/msvc8/lwIP.vcproj
index 129a071..4781220 100644
--- a/ports/win32/msvc8/lwIP.vcproj
+++ b/ports/win32/msvc8/lwIP.vcproj
@@ -120,7 +120,7 @@
 				StructMemberAlignment="1"
 				UsePrecompiledHeader="0"
 				ProgramDataBaseFileName="$(IntDir)/$(ProjectName).pdb"
-				WarningLevel="3"
+				WarningLevel="4"
 				SuppressStartupBanner="true"
 				DebugInformationFormat="3"
 				CompileAs="0"
diff --git a/ports/win32/pktif.h b/ports/win32/pktif.h
index ebbdcf7..88b16a1 100644
--- a/ports/win32/pktif.h
+++ b/ports/win32/pktif.h
@@ -2,6 +2,7 @@
 #define __PKTIF_H__
 
 #include "lwip/err.h"
+#include "lwip/netif.h"
 
 err_t ethernetif_init    (struct netif *netif);
 void  ethernetif_shutdown(struct netif *netif);
diff --git a/ports/win32/sio.c b/ports/win32/sio.c
index cca1810..838fe8d 100644
--- a/ports/win32/sio.c
+++ b/ports/win32/sio.c
@@ -60,7 +60,7 @@ static int sio_abort=0;
 sio_fd_t sio_open(u8_t devnum)
 { HANDLE hPipe = INVALID_HANDLE_VALUE;
   CHAR   szPipeName[256];
-  printf("sio_open(%lu)\n", (DWORD)devnum);
+  LWIP_DEBUGF( SIO_DEBUG, ("sio_open(%lu)\n", (DWORD)devnum));
   sprintf( szPipeName, "\\\\.\\pipe\\lwip%lu", (DWORD)(devnum));
   hPipe = CreateFile(szPipeName, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
   if (hPipe != INVALID_HANDLE_VALUE) {
@@ -90,7 +90,7 @@ void sio_send(u8_t num, sio_fd_t psio)
  */
 u8_t sio_recv(sio_fd_t psio)
 { DWORD dwNbBytesReadden = 0;
-  u8_t byte;
+  u8_t byte = 0;
   LWIP_DEBUGF( SIO_DEBUG, ("sio_recv()\n"));
   while ((sio_abort==0) && ((!ReadFile( (HANDLE)(psio), &byte, 1, &dwNbBytesReadden, NULL)) || (dwNbBytesReadden<1)));
   LWIP_DEBUGF( SIO_DEBUG, ("sio_recv()=%lu\n", (DWORD)byte));
@@ -114,7 +114,8 @@ u32_t sio_write(sio_fd_t psio, u8_t * data, u32_t len)
 }
 
 void sio_read_abort(sio_fd_t psio)
-{ LWIP_DEBUGF( SIO_DEBUG, ("sio_read_abort() !!!!!...\n"));
+{ LWIP_UNUSED_ARG(psio);
+  LWIP_DEBUGF( SIO_DEBUG, ("sio_read_abort() !!!!!...\n"));
   sio_abort=1;
   return;
 }
@@ -122,8 +123,10 @@ void sio_read_abort(sio_fd_t psio)
 void ppp_trace( int level, const char *format, ...)
 { int len;
   char buffer[1024];
-  
   va_list argList;
+
+  LWIP_UNUSED_ARG(level);
+
   va_start  ( argList, format);
   len=vsprintf( buffer, format, argList);
   buffer[len-1]='\0';
@@ -133,8 +136,10 @@ void ppp_trace( int level, const char *format, ...)
 
 int snprintf( char *buffer, size_t count, const char *format, ...)
 { int len;
-  
   va_list argList;
+
+  LWIP_UNUSED_ARG(count);
+
   va_start  ( argList, format);
   len=vsprintf( buffer, format, argList);
   buffer[len-1]='\0';
diff --git a/ports/win32/test.c b/ports/win32/test.c
index 0c43c68..beec81f 100644
--- a/ports/win32/test.c
+++ b/ports/win32/test.c
@@ -318,6 +318,7 @@ msvc_netif_init()
 
 void dns_found(const char *name, struct ip_addr *addr, void *arg)
 {
+  LWIP_UNUSED_ARG(arg);
   printf("%s: %s\n", name, addr?inet_ntoa(*(struct in_addr*)addr):"<not found>");
 }