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-rw-r--r--win32/win32.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/win32/win32.c b/win32/win32.c
index 5cb842ff76a..025c4a3726b 100644
--- a/win32/win32.c
+++ b/win32/win32.c
@@ -23,6 +23,7 @@
#include "ruby/ruby.h"
#include "ruby/encoding.h"
+#include "ruby/io.h"
#include "ruby/util.h"
#include <fcntl.h>
#include <process.h>