1 files changed, 0 insertions, 2 deletions
diff --git a/tree.h b/tree.h
index ffcac90..aad719c 100644
--- a/tree.h
+++ b/tree.h
@@ -27,8 +27,6 @@
 #ifndef	_SYS_TREE_H_
 #define	_SYS_TREE_H_
 
-#include <sys/_null.h>
-
 /*
  * This file defines data structures for different types of trees:
  * splay trees and red-black trees.