diff --git a/Cassandane/PortManager.pm b/Cassandane/PortManager.pm
index d1794eb..9a1e621 100644
--- a/Cassandane/PortManager.pm
+++ b/Cassandane/PortManager.pm
@@ -53,7 +53,7 @@ sub alloc
 	my $workerid = $ENV{TEST_UNIT_WORKER_ID} || '1';
 	die "Invalid TEST_UNIT_WORKER_ID - code not run in Worker context"
 	    if (defined($workerid) && $workerid eq 'invalid');
-	$base_port = 9100 + $max_ports * ($workerid-1);
+	$base_port = 19100 + $max_ports * ($workerid-1);
     }
     for (my $i = 0 ; $i < $max_ports ; $i++)
     {