diff --git a/aleksis/apps/alsijil/rules.py b/aleksis/apps/alsijil/rules.py
index 75b39b8c1e16c68ef52e8f2e8e4ae1b199723834..1a8a06adc1033d690d0b20cfbbe92869621767bc 100644
--- a/aleksis/apps/alsijil/rules.py
+++ b/aleksis/apps/alsijil/rules.py
@@ -85,7 +85,7 @@ edit_personal_note_predicate = view_personal_note_predicate & (
     ~is_own_personal_note
     & ~(
         is_personal_note_lesson_original_teacher
-        or not is_site_preference_set("alsijil", "edit_lesson_documentation_as_original_teacher")
+        | ~is_site_preference_set("alsijil", "edit_lesson_documentation_as_original_teacher")
     )
     | has_global_perm("alsijil.view_personalnote")
     | has_personal_note_group_perm("core.edit_personalnote_group")