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-rw-r--r--include/ruby/io.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/ruby/io.h b/include/ruby/io.h
index cde932ff32..6cacd8a710 100644
--- a/include/ruby/io.h
+++ b/include/ruby/io.h
@@ -113,6 +113,7 @@ typedef struct rb_io_t {
#define FMODE_APPEND 0x00000040
#define FMODE_CREATE 0x00000080
/* #define FMODE_NOREVLOOKUP 0x00000100 */
+#define FMODE_EXCL 0x00000400
#define FMODE_TRUNC 0x00000800
#define FMODE_TEXTMODE 0x00001000
/* #define FMODE_PREP 0x00010000 */