diff --git a/symposion/schedule/admin.py b/symposion/schedule/admin.py
index d81c130a..32df050f 100644
--- a/symposion/schedule/admin.py
+++ b/symposion/schedule/admin.py
@@ -12,17 +12,17 @@
 admin.site.register(
     Room,
     list_display=("name", "order", "schedule"),
-    list_filter=("schedule")
+    list_filter=("schedule",)
 )
 admin.site.register(
     SlotKind,
     list_display=("label", "schedule", "presentation"),
-    list_filter=("presentation")
+    list_filter=("presentation",)
 )
 admin.site.register(
     Slot,
     list_display=("day", "start", "end", "kind"),
-    list_filter=("kind")
+    list_filter=("kind",)
 )
 admin.site.register(
     SlotRoom,