diff --git a/sys/conf/NOTES b/sys/conf/NOTES
--- a/sys/conf/NOTES
+++ b/sys/conf/NOTES
@@ -2732,9 +2732,6 @@
 
 options 	CAM_DEBUG_DELAY
 
-# VFS cluster debugging.
-options 	CLUSTERDEBUG
-
 options 	DEBUG
 
 # Kernel filelock debugging.
diff --git a/sys/conf/options b/sys/conf/options
--- a/sys/conf/options
+++ b/sys/conf/options
@@ -570,7 +570,6 @@
 # Misc debug flags.  Most of these should probably be replaced with
 # 'DEBUG', and then let people recompile just the interesting modules
 # with 'make CC="cc -DDEBUG"'.
-CLUSTERDEBUG		opt_debug_cluster.h
 DEBUG_1284		opt_ppb_1284.h
 LPT_DEBUG		opt_lpt.h
 PLIP_DEBUG		opt_plip.h
diff --git a/sys/kern/vfs_cluster.c b/sys/kern/vfs_cluster.c
--- a/sys/kern/vfs_cluster.c
+++ b/sys/kern/vfs_cluster.c
@@ -36,8 +36,6 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
-#include "opt_debug_cluster.h"
-
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/kernel.h>
@@ -56,12 +54,6 @@
 #include <vm/vm_page.h>
 #include <sys/sysctl.h>
 
-#if defined(CLUSTERDEBUG)
-static int	rcluster= 0;
-SYSCTL_INT(_debug, OID_AUTO, rcluster, CTLFLAG_RW, &rcluster, 0,
-    "Debug VFS clustering code");
-#endif
-
 static MALLOC_DEFINE(M_SEGMENT, "cl_savebuf", "cluster_save buffer");
 static uma_zone_t cluster_pbuf_zone;