diff --git a/sys/arch/vax/vax/pmap.c b/sys/arch/vax/vax/pmap.c
index 3f6826aa939d..2ba9bd0697ec 100644
--- a/sys/arch/vax/vax/pmap.c
+++ b/sys/arch/vax/vax/pmap.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: pmap.c,v 1.113 2002/04/04 16:40:15 ragge Exp $	   */
+/*	$NetBSD: pmap.c,v 1.114 2002/06/06 12:28:44 ragge Exp $	   */
 /*
  * Copyright (c) 1994, 1998, 1999 Ludd, University of Lule}, Sweden.
  * All rights reserved.
@@ -33,6 +33,7 @@
 #include "opt_cputype.h"
 #include "opt_multiprocessor.h"
 #include "opt_lockdebug.h"
+#include "opt_pipe.h"
 
 #include <sys/types.h>
 #include <sys/param.h>
@@ -198,6 +199,17 @@ calc_kvmsize(vsize_t usrptsize)
 #define MAXLKMSIZ	0x100000	/* XXX */
 	kvmsize += MAXLKMSIZ;
 #endif
+
+	/* The swapper uses many anon's, set an arbitrary size */
+#ifndef SWAPSIZE
+#define	SWAPSIZE (200*1024*1024)	/* Assume 200MB swap */
+#endif
+	kvmsize += ((SWAPSIZE/PAGE_SIZE)*sizeof(struct vm_anon));
+
+	/* New pipes may steal some amount of memory. Calculate 10 pipes */
+#ifndef PIPE_SOCKETPAIR
+	kvmsize += PIPE_DIRECT_CHUNK*10;
+#endif
 	return kvmsize;
 }