1 files changed, 2 insertions, 0 deletions
diff --git a/rubyio.h b/rubyio.h
index ae4db3bb0f..6039158d55 100644
--- a/rubyio.h
+++ b/rubyio.h
@@ -39,6 +39,8 @@ typedef struct OpenFile {
 #define FMODE_SYNC      8
 #define FMODE_WBUF     16
 #define FMODE_RBUF     32
+#define FMODE_WSPLIT  0x200
+#define FMODE_WSPLIT_INITIALIZED  0x400
 
 #define GetOpenFile(obj,fp) rb_io_check_closed((fp) = RFILE(rb_io_taint_check(obj))->fptr)