diff --git a/mrbgems/mruby-print/src/print.c b/mrbgems/mruby-print/src/print.c
index f69254076..da5f36789 100644
--- a/mrbgems/mruby-print/src/print.c
+++ b/mrbgems/mruby-print/src/print.c
@@ -3,16 +3,20 @@
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
-#if defined(__MINGW32__) || defined(__MINGW64__)
+#if defined(_WIN32)
 # include <windows.h>
 # include <io.h>
+#ifdef _MSC_VER
+# define isatty(x) _isatty(x)
+# define fileno(x) _fileno(x)
+#endif
 #endif
 
 static void
 printstr(mrb_state *mrb, mrb_value obj)
 {
   if (mrb_string_p(obj)) {
-#if defined(__MINGW32__) || defined(__MINGW64__)
+#if defined(_WIN32)
     if (isatty(fileno(stdout))) {
       DWORD written;
       int mlen = RSTRING_LEN(obj);