diff --git a/src/calibre/library/server/browse.py b/src/calibre/library/server/browse.py
index c45a47932d..f3a319f173 100644
--- a/src/calibre/library/server/browse.py
+++ b/src/calibre/library/server/browse.py
@@ -464,7 +464,8 @@ class BrowseServer(object):
             sort = 'title'
         self.sort(items, 'title', True)
         if sort != 'title':
-            ascending = fm[sort]['datatype'] not in ('rating', 'datetime')
+            ascending = fm[sort]['datatype'] not in ('rating', 'datetime',
+                    'series')
             self.sort(items, sort, ascending)
         return sort