diff --git a/share/man/man9/kern_reboot.9 b/share/man/man9/kern_reboot.9
--- a/share/man/man9/kern_reboot.9
+++ b/share/man/man9/kern_reboot.9
@@ -96,13 +96,6 @@
 .Dv 1 ,
 indicating that the reboot process has begun and cannot be stopped.
 .It
-Set the
-.Va kdb_active
-variable to
-.Dv 0 ,
-indicating that execution has left the kernel debugger, if it was previously
-active.
-.It
 Unless the
 .Dv RB_NOSYNC
 flag is set in
diff --git a/sys/kern/kern_shutdown.c b/sys/kern/kern_shutdown.c
--- a/sys/kern/kern_shutdown.c
+++ b/sys/kern/kern_shutdown.c
@@ -492,9 +492,6 @@
 	rebooting = 1;
 	reboottrace(howto);
 
-	/* We are out of the debugger now. */
-	kdb_active = 0;
-
 	/*
 	 * Do any callouts that should be done BEFORE syncing the filesystems.
 	 */