diff --git a/aleksis/apps/alsijil/models.py b/aleksis/apps/alsijil/models.py
index 48c7d1aca9d177fd54f21e844684aad25655f352..91fe27f044fb99587b77da89aaad954e96ddd29e 100644
--- a/aleksis/apps/alsijil/models.py
+++ b/aleksis/apps/alsijil/models.py
@@ -118,7 +118,7 @@ class Documentation(CalendarEvent):
             return self.course.groups.all()
 
     def get_teachers_short_names(self) -> List[str]:
-        return [teacher.short_name or teacher.name for teacher in self.teachers]
+        return [teacher.short_name or teacher.name for teacher in self.teachers.all()]
 
     def __str__(self) -> str:
         start_datetime = CalendarEvent.value_start_datetime(self)