diff --git a/aleksis/apps/chronos/rules.py b/aleksis/apps/chronos/rules.py
index d814dd5b22adc24acdbbfc4c496875983bb1a626..34d58360ce18353231f56acccf1a00818f479fbb 100644
--- a/aleksis/apps/chronos/rules.py
+++ b/aleksis/apps/chronos/rules.py
@@ -1,13 +1,11 @@
 from rules import add_perm
 
 from aleksis.core.util.predicates import (
-    has_any_object,
     has_global_perm,
     has_object_perm,
     has_person,
 )
 
-from .models import LessonSubstitution
 from .util.predicates import has_any_timetable_object, has_room_timetable_perm, has_timetable_perm
 
 # View timetable overview
@@ -42,9 +40,7 @@ delete_substitution_predicate = has_person & (
 add_perm("chronos.delete_substitution_rule", delete_substitution_predicate)
 
 # View substitutions
-view_substitutions_predicate = has_person & (
-    has_global_perm("chronos.view_lessonsubstitution")
-)
+view_substitutions_predicate = has_person & (has_global_perm("chronos.view_lessonsubstitution"))
 add_perm("chronos.view_substitutions_rule", view_substitutions_predicate)
 
 # View all supervisions per day