diff --git a/patch-cassandane-base-port b/patch-cassandane-base-port
new file mode 100644
index 0000000..b7c52c7
--- /dev/null
+++ b/patch-cassandane-base-port
@@ -0,0 +1,13 @@
+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++)
+     {