diff --git a/source/_posts/oztex.md b/source/_posts/oztex.md
index 1c9485b..2466511 100644
--- a/source/_posts/oztex.md
+++ b/source/_posts/oztex.md
@@ -91,6 +91,7 @@ var telnet;
                 var url = document.location.href;
                 $D('host').value = 'chinwag.leenooks.net';
                 $D('port').value = '443';
+                $D('encrypt').checked = true;
                 $D('url').value = '/ws/videotex/516';
 
                 telnet = Telnet('terminal', connected, disconnected);