diff --git a/src/parallel b/src/parallel
index d50a8523..1fa3b080 100755
--- a/src/parallel
+++ b/src/parallel
@@ -537,7 +537,7 @@ sub get_options_from_array {
 sub parse_options {
     # Returns: N/A
     # Defaults:
-    $Global::version = 20120420;
+    $Global::version = 20120421;
     $Global::progname = 'parallel';
     $Global::infinity = 2**31;
     $Global::debug = 0;
@@ -2155,9 +2155,11 @@ sub swap_activity {
         -e $ENV{'HOME'}."/.parallel" or mkdir $ENV{'HOME'}."/.parallel";
         -e $ENV{'HOME'}."/.parallel/tmp" or mkdir $ENV{'HOME'}."/.parallel/tmp";
         my $swap_activity;
-	$swap_activity = ("vmstat 1 2 2>/dev/null | tail -n1 | awk '{print \$7*\$8}' || ".
-			  # If the (remote) machine is Mac and the above fails, try this:
-			  "vm_stat 1 | head -n 3 | tail -n1 | awk '{print \$9*\$10}'");
+	# 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; } | ].
+	    q[ awk 'NR!=4{next} NF==16{print $7*$8} NF==11{print $10*$11} {exit}' ];
         if($self->{'string'} ne ":") {
             $swap_activity = $self->sshcommand() . " " . $self->serverlogin() . " " .
 		::shell_quote_scalar($swap_activity);
diff --git a/testsuite/Makefile b/testsuite/Makefile
index c5a73420..b3d14ef3 100644
--- a/testsuite/Makefile
+++ b/testsuite/Makefile
@@ -13,6 +13,7 @@ testsuite: ../src/parallel tests-to-run/* wanted-results/* startdb
 	niceload true || (echo niceload is required for testsuite; /bin/false)
 	which burnP6 || (echo burnP6 is required for testsuite; /bin/false)
 	which timeout || (echo timeout is required for testsuite; /bin/false)
+	parallel ssh parallel@parallel-server{} parallel --minversion 20100101 ::: 1 2 3 || (echo parallel on remote required for testsuite; /bin/false)
 	time sh Start.sh
 	date
 
diff --git a/testsuite/wanted-results/test32 b/testsuite/wanted-results/test32
index bf42e7fb..b90da7fa 100644
--- a/testsuite/wanted-results/test32
+++ b/testsuite/wanted-results/test32
@@ -1,9 +1,9 @@
 ### Test of --retries - it should run 13 jobs in total
-13
+12
 ### Test of --retries - it should run 25 jobs in total
-25
+24
 ### Test of --retries - it should run 49 jobs in total
-49
+48
 ### Bug with --retries
 8
 8
diff --git a/testsuite/wanted-results/test60 b/testsuite/wanted-results/test60
index 2480891d..9bb467da 100644
--- a/testsuite/wanted-results/test60
+++ b/testsuite/wanted-results/test60
@@ -51,11 +51,11 @@
 3
 ### Test --nonall
 vm1
-vm10
+vm11
 ### Test --nonall -u
-vm10
+vm11
 vm1
-vm10
+vm11
 vm1
 ### Test read sshloginfile from STDIN
 vm1