diff --git a/dav_events/views/events.py b/dav_events/views/events.py
index 149e500..69139bd 100644
--- a/dav_events/views/events.py
+++ b/dav_events/views/events.py
@@ -28,7 +28,7 @@ class EventListView(generic.ListView):
             qs = self.model.objects.all()
         else:
             user_sports_list = list()
-            for k in ['W', 'S', 'M', 'K', 'B']:
+            for k in ('W', 'S', 'M', 'K', 'B'):
                 group_name_var = 'MANAGE_{}_GROUP'.format(k)
                 group_name = getattr(config, group_name_var, None)
                 if group_name and user.groups.filter(name=group_name).count():