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-rw-r--r--tools/testing/selftests/vm/mlock2-tests.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/testing/selftests/vm/mlock2-tests.c b/tools/testing/selftests/vm/mlock2-tests.c
index 4431994aade2..cb247219f1f7 100644
--- a/tools/testing/selftests/vm/mlock2-tests.c
+++ b/tools/testing/selftests/vm/mlock2-tests.c
@@ -1,3 +1,4 @@
+#define _GNU_SOURCE
#include <sys/mman.h>
#include <stdint.h>
#include <stdio.h>