diff --git a/src/allmydata/web/directory.py b/src/allmydata/web/directory.py
index d9273e073..5fe2db632 100644
--- a/src/allmydata/web/directory.py
+++ b/src/allmydata/web/directory.py
@@ -367,6 +367,7 @@ class DirectoryAsHTML(rend.Page):
     # The remainder of this class is to render the directory into
     # human+browser -oriented HTML.
     docFactory = getxmlfile("directory.xhtml")
+    addSlash = True
 
     def __init__(self, node):
         rend.Page.__init__(self)