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-rw-r--r--tools/bpf/bpftool/iter.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/bpf/bpftool/iter.c b/tools/bpf/bpftool/iter.c
index f88fdc820d23..a3e6b167153d 100644
--- a/tools/bpf/bpftool/iter.c
+++ b/tools/bpf/bpftool/iter.c
@@ -1,7 +1,9 @@
// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
// Copyright (C) 2020 Facebook
+#ifndef _GNU_SOURCE
#define _GNU_SOURCE
+#endif
#include <unistd.h>
#include <linux/err.h>
#include <bpf/libbpf.h>