diff --git a/lib/locking-selftest-mutex.h b/lib/locking-selftest-mutex.h
new file mode 100644
index 0000000..68601b6
--- /dev/null
+++ b/lib/locking-selftest-mutex.h
@@ -0,0 +1,11 @@
+#undef LOCK
+#define LOCK		ML
+
+#undef UNLOCK
+#define UNLOCK		MU
+
+#undef RLOCK
+#undef WLOCK
+
+#undef INIT
+#define INIT		MI