diff --git a/lms/djangoapps/django_comment_client/forum/urls.py b/lms/djangoapps/django_comment_client/forum/urls.py
index 76957a82d8..974a0b2c7b 100644
--- a/lms/djangoapps/django_comment_client/forum/urls.py
+++ b/lms/djangoapps/django_comment_client/forum/urls.py
@@ -3,7 +3,7 @@ import django_comment_client.forum.views
 
 urlpatterns = patterns('django_comment_client.forum.views',
     url(r'users/(?P<user_id>\w+)$', 'user_profile', name='user_profile'),
-    url(r'(?P<discussion_id>\w+)/threads/(?P<thread_id>\w+)$', 'single_thread', name='single_thread'),
-    url(r'(?P<discussion_id>\w+)/inline$', 'inline_discussion', name='inline_discussion'),
+    url(r'(?P<discussion_id>[\w\-]+)/threads/(?P<thread_id>\w+)$', 'single_thread', name='single_thread'),
+    url(r'(?P<discussion_id>[\w\-]+)/inline$', 'inline_discussion', name='inline_discussion'),
     url(r'', 'forum_form_discussion', name='forum_form_discussion'),
 )