--- parallel.org
+++ parallel.new
@@ -2239,7 +2239,7 @@
 	# If the (remote) machine is Mac we should use vm_stat
 	# swap_in and swap_out on GNU/Linux is $7 and $8
 	# swap_in and swap_out on Mac is $10 and $11
-	$swap_activity = q[ { vmstat 1 2> /dev/null || vm_stat 1; } | ].
+	$swap_activity = q[ { vmstat 1 2 2> /dev/null || vm_stat 1; } | ].
 	    q[ awk 'NR!=4{next} NF==16{print $7*$8} NF==11{print $10*$11} {exit}' ];
         if($self->{'string'} ne ":") {
             $swap_activity = $self->sshcommand() . " " . $self->serverlogin() . " " .