Index: kernel/generic/include/typedefs.h
===================================================================
--- kernel/generic/include/typedefs.h	(revision 14795627234b341479d2a8da2a14117d97de69cc)
+++ kernel/generic/include/typedefs.h	(revision cc3c2a1cbf221abe6acbd9058fc3f30467b1e43b)
@@ -40,5 +40,5 @@
 #include <arch/types.h>
 
-#define NULL  0
+#define NULL  0UL
 
 #define false  0