Index: kernel/generic/include/typedefs.h
===================================================================
--- kernel/generic/include/typedefs.h	(revision 04cb68f2d06da3440e206ec4339c4d23afa3910a)
+++ kernel/generic/include/typedefs.h	(revision dd5046dd1beda773c101cd57515df9157d461a36)
@@ -40,5 +40,5 @@
 #include <arch/types.h>
 
-#define NULL  0
+#define NULL  0UL
 
 #define false  0