diff --git a/proc/sysv-lib.pl b/proc/sysv-lib.pl
index 631d49d55..94a7446d3 100755
--- a/proc/sysv-lib.pl
+++ b/proc/sysv-lib.pl
@@ -219,12 +219,15 @@ if (!&has_command("kstat")) {
 	return ( );
 	}
 local %stat;
-foreach my $s ("physmem", "freemem") {
+foreach my $s ("physmem", "freemem", "zone_memory_cap") {
 	local $out = &backquote_command("kstat -p -m unix -s $s");
 	if ($out =~ /\s+(\d+)/) {
 		$stat{$s} = $1;
 		}
 	}
+if ($stat{'zone_memory_cap'} > $stat{'physmem'}) {
+	delete($stat{'zone_memory_cap'});
+	}
 local ($swaptotal, $swapfree);
 &open_execute_command(SWAP, "swap -l", 1);
 while(<SWAP>) {
@@ -237,8 +240,10 @@ close(SWAP);
 local $pagesize = &backquote_command("pagesize 2>/dev/null");
 $pagesize = int($pagesize)/1024;
 $pagesize ||= 8;	# Fallback
-return ($stat{'physmem'}*$pagesize, $stat{'freemem'}*$pagesize,
-	$swaptotal/2, $swapfree/2);
+return (($stat{'zone_memory_cap'} || $stat{'physmem'})*$pagesize,
+	$stat{'freemem'}*$pagesize,
+	$swaptotal/2,
+	$swapfree/2);
 }