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-rw-r--r--mrbgems/mruby-io/src/io.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/mrbgems/mruby-io/src/io.c b/mrbgems/mruby-io/src/io.c
index 643671d1e..0abb9014a 100644
--- a/mrbgems/mruby-io/src/io.c
+++ b/mrbgems/mruby-io/src/io.c
@@ -25,6 +25,7 @@
#include <io.h>
#define open _open
#define close _close
+ #define dup _dup
#define read _read
#define write _write
#define lseek _lseek