Index: kernel/generic/include/typedefs.h
===================================================================
--- kernel/generic/include/typedefs.h	(revision 14795627234b341479d2a8da2a14117d97de69cc)
+++ kernel/generic/include/typedefs.h	(revision 0b5a41318bb6a61d594dc8dff3453b5d212638ba)
@@ -40,5 +40,5 @@
 #include <arch/types.h>
 
-#define NULL  0
+#define NULL  0UL
 
 #define false  0