diff --git a/ietf/meeting/views.py b/ietf/meeting/views.py
index a20468b4c..3f6a99728 100644
--- a/ietf/meeting/views.py
+++ b/ietf/meeting/views.py
@@ -160,7 +160,8 @@ def materials_document(request, document, num=None, ext=None):
     if num is None:
         num = get_meeting(num).number
     if (re.search('^\w+-\d+-.+-\d\d$', document) or
-        re.search('^\w+-interim-\d+-\.+-\d\d-\d\d$', document)):
+        re.search('^\w+-interim-\d+-.+-\d\d-\d\d$', document) or
+        re.search('^slides-interim-\d+-.+-\d\d$', document)):
         name, rev = document.rsplit('-', 1)
     else:
         name, rev = document, None