--- a/include/windows/sys/queue.h	(index)
+++ b/include/windows/sys/queue.h	(working tree)
@@ -35,8 +35,6 @@
 #ifndef	_SYS_QUEUE_H_
 #define	_SYS_QUEUE_H_

-#include <sys/_null.h>
-
 /*
  * This file defines five types of data structures: singly-linked lists,
  * lists, simple queues, tail queues and XOR simple queues.