diff --git a/include/stdlib.h b/include/stdlib.h
index 05148d7da..e789f732b 100644
--- a/include/stdlib.h
+++ b/include/stdlib.h
@@ -45,9 +45,8 @@ typedef unsigned size_t;
 #endif
 
 /* NULL pointer */
-#ifndef _HAVE_NULL
-#define NULL    ((void *) 0)
-#define _HAVE_NULL
+#ifndef NULL
+#define NULL ((void *) 0)
 #endif
 
 /* Standard exit codes */