diff --git a/biscuit/apps/chronos/models.py b/biscuit/apps/chronos/models.py
index e985c6cf06c76c414f42fd73b3beb69a28fdd553..2e4e512c53949f1ff7221dfbdca61b0c17826079 100644
--- a/biscuit/apps/chronos/models.py
+++ b/biscuit/apps/chronos/models.py
@@ -72,25 +72,25 @@ class LessonPeriodQuerySet(models.QuerySet):
         """ Filter for all lessons a participant (student) attends. """
 
         return self.filter(
-                Q(lesson__groups__members=person) | Q(lesson__groups__parent_groups__members=person))
+            Q(lesson__groups__members=person) | Q(lesson__groups__parent_groups__members=person))
 
     def filter_group(self, group: Union[Group, int]):
         """ Filter for all lessons a group (class) regularly attends. """
 
         return self.filter(
-                Q(lesson__groups=group) | Q(lesson__groups__parent_groups=group))
+            Q(lesson__groups=group) | Q(lesson__groups__parent_groups=group))
 
     def filter_teacher(self, teacher: Union[Person, int]):
         """ Filter for all lessons given by a certain teacher. """
 
         return self.filter(
-                Q(substitutions__teachers=teacher, substitutions__week=models.F('_week')) | Q(lesson__teachers=teacher))
+            Q(substitutions__teachers=teacher, substitutions__week=models.F('_week')) | Q(lesson__teachers=teacher))
 
     def filter_room(self, room: Union[Room, int]):
         """ Filter for all lessons taking part in a certain room. """
 
         return self.filter(
-                Q(substitutions__room=room, substitutions__week=models.F('_week')) | Q(room=room))
+            Q(substitutions__room=room, substitutions__week=models.F('_week')) | Q(room=room))
 
     def annotate_week(self, week: Union[CalendarWeek, int]):
         """ Annotate all lessons in the QuerySet with the number of the provided calendar week. """
@@ -233,7 +233,7 @@ class Lesson(SchoolRelated):
     def get_calendar_week(self, week: int):
         year = self.date_start.year
         if week < int(self.date_start.strftime('%V')):
-           year += 1
+            year += 1
 
         return CalendarWeek(year=year, week=week)
 
@@ -319,8 +319,8 @@ class LessonPeriod(SchoolRelated):
 
     def __str__(self) -> str:
         return '%s, %d., %s, %s' % (self.period.get_weekday_display(), self.period.period,
-            ', '.join(list(self.lesson.groups.values_list('short_name', flat=True))),
-            self.lesson.subject.name)
+                                    ', '.join(list(self.lesson.groups.values_list('short_name', flat=True))),
+                                    self.lesson.subject.name)
 
     class Meta:
         ordering = ['lesson__date_start', 'period__weekday', 'period__period']
diff --git a/biscuit/apps/chronos/templatetags/week_helpers.py b/biscuit/apps/chronos/templatetags/week_helpers.py
index 8f860092b265bc0addf06021c247258e0beadecc..b70663dc61497a2088e178553505d6eeb1bce050 100644
--- a/biscuit/apps/chronos/templatetags/week_helpers.py
+++ b/biscuit/apps/chronos/templatetags/week_helpers.py
@@ -22,8 +22,8 @@ def week_end(week: CalendarWeek) -> date:
 
 @register.filter
 def only_week(qs: QuerySet, week: Optional[CalendarWeek]) -> QuerySet:
-   wanted_week = week or CalendarWeek()
-   return qs.filter(week=wanted_week.week)
+    wanted_week = week or CalendarWeek()
+    return qs.filter(week=wanted_week.week)
 
 
 @register.simple_tag