diff --git a/mrbgems/hal-win-socket/src/socket_hal.c b/mrbgems/hal-win-socket/src/socket_hal.c
index cfd467b34..9b28d324a 100644
--- a/mrbgems/hal-win-socket/src/socket_hal.c
+++ b/mrbgems/hal-win-socket/src/socket_hal.c
@@ -7,16 +7,16 @@
 ** Supported platforms: Windows, MinGW
 */
 
+#ifndef _WIN32_WINNT
+#define _WIN32_WINNT 0x0501 // need Windows XP or later
+#endif
+
 #include <mruby.h>
 #include <mruby/string.h>
 #include <mruby/class.h>
 #include <mruby/error.h>
 #include <mruby/presym.h>
 #include "socket_hal.h"
-
-#ifndef _WIN32_WINNT
-#define _WIN32_WINNT 0x0501
-#endif
 #include <winsock2.h>
 #include <ws2tcpip.h>
 #include <windows.h>