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-rw-r--r--libio/iofopncook.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/libio/iofopncook.c b/libio/iofopncook.c
index a08dfdaa42..982f464a68 100644
--- a/libio/iofopncook.c
+++ b/libio/iofopncook.c
@@ -172,6 +172,8 @@ _IO_cookie_init (struct _IO_cookie_file *cfile, int read_write,
_IO_mask_flags (&cfile->__fp.file, read_write,
_IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING);
+ cfile->__fp.file._flags2 |= _IO_FLAGS2_NEED_LOCK;
+
/* We use a negative number different from -1 for _fileno to mark that
this special stream is not associated with a real file, but still has
to be treated as such. */