diff --git a/mrbgems/mruby-socket/test/sockettest.c b/mrbgems/mruby-socket/test/sockettest.c
index 7c820a555..086bc4892 100644
--- a/mrbgems/mruby-socket/test/sockettest.c
+++ b/mrbgems/mruby-socket/test/sockettest.c
@@ -10,7 +10,8 @@
 
 #ifdef _MSC_VER
 
-#include <io.h>
+#include <fcntl.h>
+#include <sys/stat.h>
 #define close _close
 #define unlink _unlink