diff --git a/src/openvpn/error.c b/src/openvpn/error.c
index 89a08cec..a2c9aa4c 100644
--- a/src/openvpn/error.c
+++ b/src/openvpn/error.c
@@ -695,14 +695,14 @@ x_check_status(int status,
         {
             if (extended_msg)
             {
-                msg(x_cs_info_level, "%s %s [%s]: %s (fd=%d,code=%d)", description,
+                msg(x_cs_info_level, "%s %s [%s]: %s (fd=" SOCKET_PRINTF ",code=%d)", description,
                     sock ? proto2ascii(sock->info.proto, sock->info.af, true) : "",
                     extended_msg, openvpn_strerror(my_errno, crt_error, &gc),
                     sock ? sock->sd : -1, my_errno);
             }
             else
             {
-                msg(x_cs_info_level, "%s %s: %s (fd=%d,code=%d)", description,
+                msg(x_cs_info_level, "%s %s: %s (fd=" SOCKET_PRINTF ",code=%d)", description,
                     sock ? proto2ascii(sock->info.proto, sock->info.af, true) : "",
                     openvpn_strerror(my_errno, crt_error, &gc),
                     sock ? sock->sd : -1, my_errno);
diff --git a/src/openvpn/syshead.h b/src/openvpn/syshead.h
index fe91bc11..12ccf2f4 100644
--- a/src/openvpn/syshead.h
+++ b/src/openvpn/syshead.h
@@ -48,7 +48,6 @@
 #ifdef _MSC_VER /* Visual Studio */
 #define __func__ __FUNCTION__
 #define __attribute__(x)
-#include <inttypes.h>
 #endif
 
 #if defined(__APPLE__)
@@ -442,9 +441,11 @@ typedef unsigned short sa_family_t;
  */
 #ifdef _WIN32
 #define SOCKET_UNDEFINED (INVALID_SOCKET)
+#define SOCKET_PRINTF "%" PRIuPTR
 typedef SOCKET socket_descriptor_t;
 #else
 #define SOCKET_UNDEFINED (-1)
+#define SOCKET_PRINTF "%d"
 typedef int socket_descriptor_t;
 #endif