diff --git a/deluge/ui/gtkui/listview.py b/deluge/ui/gtkui/listview.py
index e639c21bb..47e654df4 100644
--- a/deluge/ui/gtkui/listview.py
+++ b/deluge/ui/gtkui/listview.py
@@ -188,7 +188,7 @@ class ListView(object):
         # Using the default sort column
         elif self.default_sort_column_id:
             self.model_filter.set_sort_column_id(self.default_sort_column_id, gtk.SORT_ASCENDING)
-        self.model_filter.set_default_sort_func(None)
+        self.model_filter.set_default_sort_func(lambda x: None)
 
     def get_sort_column_from_state(self):
         """Find the first (should only be one) state with sort enabled"""