diff --git a/include/stdio.h b/include/stdio.h
index 858dd5059..012b8e2ba 100644
--- a/include/stdio.h
+++ b/include/stdio.h
@@ -38,9 +38,8 @@
 
 
 /* NULL pointer */
-#ifndef _HAVE_NULL
-#define NULL    0
-#define _HAVE_NULL
+#ifndef NULL
+#define NULL ((void *) 0)
 #endif
 
 /* size_t is needed */