diff --git a/aleksis/apps/chronos/models.py b/aleksis/apps/chronos/models.py
index c2037dc4ae2be3bbcb17275ab3eaa84c20b6d296..5b19ef630813f656ddbd66ecf1c8cb2c08663930 100644
--- a/aleksis/apps/chronos/models.py
+++ b/aleksis/apps/chronos/models.py
@@ -1064,7 +1064,7 @@ class ExtraLessonQuerySet(TimetableQuerySet):
         )
 
     def on_day(self, day:date):
-        self.within_dates(day, day)
+        return self.within_dates(day, day)
 
 
 class ExtraLesson(ExtensibleModel):