diff --git a/ietf/meeting/views.py b/ietf/meeting/views.py
index 61ca6eb94..a20468b4c 100644
--- a/ietf/meeting/views.py
+++ b/ietf/meeting/views.py
@@ -159,12 +159,11 @@ def current_materials(request):
 def materials_document(request, document, num=None, ext=None):
     if num is None:
         num = get_meeting(num).number
-    if (re.search('^\w+-\d+-\w+-\d\d$', document) or
-        re.search('^\w+-interim-\d+-\w+-\d\d-\d\d$', document)):
+    if (re.search('^\w+-\d+-.+-\d\d$', document) or
+        re.search('^\w+-interim-\d+-\.+-\d\d-\d\d$', document)):
         name, rev = document.rsplit('-', 1)
     else:
         name, rev = document, None
-
     doc = get_object_or_404(Document, name=name)
     if not doc.meeting_related():
         raise Http404("Not a meeting related document")