diff --git a/tools/build/feature/test-sched_getcpu.c b/tools/build/feature/test-sched_getcpu.c
index e448deb4124c1ea8ed96f7b9a430095cdcac2e88..48995ac7911eae5084fada30c9b48069bdf2ba77 100644
--- a/tools/build/feature/test-sched_getcpu.c
+++ b/tools/build/feature/test-sched_getcpu.c
@@ -8,3 +8,5 @@ int main(void)
 {
 	return sched_getcpu();
 }
+
+#undef _GNU_SOURCE