diff --git a/sys/include/sys/_null.h b/sys/include/sys/_null.h
new file mode 100644
index 0000000..b290b3f
--- /dev/null
+++ b/sys/include/sys/_null.h
@@ -0,0 +1,19 @@
+#ifndef NULL
+
+#if !defined(__cplusplus)
+#define NULL    ((void *)0)
+#else
+#if __cplusplus >= 201103L
+#define NULL    nullptr
+#elif defined(__GNUG__) && defined(__GNUC__) && __GNUC__ >= 4
+#define NULL    __null
+#else
+#if defined(__LP64__)
+#define NULL    (0L)
+#else
+#define NULL    0
+#endif  /* __LP64__ */
+#endif  /* __GNUG__ */
+#endif  /* !__cplusplus */
+
+#endif