diff --git a/tperimeter-ui.html b/tperimeter-ui.html
index 7594fdc..020f15c 100644
--- a/tperimeter-ui.html
+++ b/tperimeter-ui.html
@@ -15,7 +15,7 @@
   (And then sent to Detroit.)
 </em></p>
 
-  <form action="/cgi-bin/perimeter/perimeter.py">
+  <form action="/cgi-bin/tperimeter/tperimeter.py">
   <fieldset style="margin: 4em; text-align: center;">
 
     Service: