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-rw-r--r--libio/libio.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/libio/libio.h b/libio/libio.h
index d26a5e5979..e662f48918 100644
--- a/libio/libio.h
+++ b/libio/libio.h
@@ -133,6 +133,7 @@
 #define _IO_IS_APPENDING 0x1000
 #define _IO_IS_FILEBUF 0x2000
 #define _IO_BAD_SEEN 0x4000
+#define _IO_USER_LOCK 0x8000
 
 /* These are "formatting flags" matching the iostream fmtflags enum values. */
 #define _IO_SKIPWS 01