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-rw-r--r--lib/fwriting.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/fwriting.c b/lib/fwriting.c
index 7ce0925976..4ecf4b0a09 100644
--- a/lib/fwriting.c
+++ b/lib/fwriting.c
@@ -27,7 +27,7 @@ fwriting (FILE *fp)
/* Most systems provide FILE as a struct and the necessary bitmask in
<stdio.h>, because they need it for implementing getc() and putc() as
fast macros. */
-#if defined _IO_ferror_unlocked || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Linux libc5 */
+#if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
return (fp->_flags & (_IO_NO_READS | _IO_CURRENTLY_PUTTING)) != 0;
#elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
return (fp_->_flags & __SWR) != 0;