diff --git a/sys/kern/subr_extent.c b/sys/kern/subr_extent.c
index 7b829d086240..7bc65a6714ce 100644
--- a/sys/kern/subr_extent.c
+++ b/sys/kern/subr_extent.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: subr_extent.c,v 1.63 2007/03/12 18:18:34 ad Exp $	*/
+/*	$NetBSD: subr_extent.c,v 1.64 2007/03/13 13:25:57 dogcow Exp $	*/
 
 /*-
  * Copyright (c) 1996, 1998 The NetBSD Foundation, Inc.
@@ -41,7 +41,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: subr_extent.c,v 1.63 2007/03/12 18:18:34 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: subr_extent.c,v 1.64 2007/03/13 13:25:57 dogcow Exp $");
 
 #ifdef _KERNEL
 #include "opt_lockdebug.h"
@@ -96,6 +96,10 @@ splhigh()			(1)
 #define	\
 splx(s)				((void)(s))
 
+#undef simple_lock_init
+#undef simple_lock
+#undef simple_unlock
+
 #define	\
 simple_lock_init(l)		((void)(l))
 #define	\