diff --git a/sys/conf/files b/sys/conf/files
index 9c71baf497a9..e433bb88a2f2 100644
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -1,4 +1,4 @@
-#	$NetBSD: files,v 1.271 1999/02/07 09:34:58 jonathan Exp $
+#	$NetBSD: files,v 1.272 1999/02/09 02:15:45 kml Exp $
 
 #	@(#)files.newconf	7.5 (Berkeley) 5/10/93
 
@@ -70,6 +70,8 @@ defopt	TCP_COMPAT_42
 defopt	TCP_RECVSPACE
 defopt	TCP_SENDSPACE
 
+defopt	SB_MAX
+
 # these are not together so that turning on UVMHIST only affects files that
 # use it, not most of the kernel
 defopt	opt_uvm.h	UVM
diff --git a/sys/sys/socketvar.h b/sys/sys/socketvar.h
index c0bf631e826c..fc715e922ace 100644
--- a/sys/sys/socketvar.h
+++ b/sys/sys/socketvar.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: socketvar.h,v 1.33 1999/01/20 09:15:42 mycroft Exp $	*/
+/*	$NetBSD: socketvar.h,v 1.34 1999/02/09 02:15:45 kml Exp $	*/
 
 /*-
  * Copyright (c) 1982, 1986, 1990, 1993
@@ -43,6 +43,8 @@
 
 #ifndef _KERNEL
 struct uio;
+
+#include "opt_sb_max.h"
 #endif
 
 TAILQ_HEAD(soqhead, socket);
@@ -97,7 +99,11 @@ struct socket {
 		short	sb_flags;	/* flags, see below */
 		short	sb_timeo;	/* timeout for read/write */
 	} so_rcv, so_snd;
+
+#ifndef SB_MAX
 #define	SB_MAX		(256*1024)	/* default for max chars in sockbuf */
+#endif
+
 #define	SB_LOCK		0x01		/* lock on data queue */
 #define	SB_WANT		0x02		/* someone is waiting to lock */
 #define	SB_WAIT		0x04		/* someone is waiting for data/space */