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-rw-r--r--libio/libio.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/libio/libio.h b/libio/libio.h
index efd09f120b4..f4ead83c4a6 100644
--- a/libio/libio.h
+++ b/libio/libio.h
@@ -353,7 +353,7 @@ typedef int __io_seek_fn (void *__cookie, _IO_off64_t *__pos, int __w);
typedef int __io_close_fn (void *__cookie);
-#ifdef _GNU_SOURCE
+#ifdef __USE_GNU
/* User-visible names for the above. */
typedef __io_read_fn cookie_read_function_t;
typedef __io_write_fn cookie_write_function_t;