1 files changed, 1 insertions, 0 deletions
diff --git a/rubyio.h b/rubyio.h
index 26f86b0d07..a3d55b81df 100644
--- a/rubyio.h
+++ b/rubyio.h
@@ -29,6 +29,7 @@ typedef struct OpenFile {
 #define FMODE_READABLE  1
 #define FMODE_WRITABLE  2
 #define FMODE_READWRITE 3
+#define FMODE_APPEND   64
 #define FMODE_BINMODE   4
 #define FMODE_SYNC      8
 #define FMODE_WBUF     16