diff --git a/lib/src/note/positioned_note.dart b/lib/src/note/positioned_note.dart
index 69383d80..a330bae9 100644
--- a/lib/src/note/positioned_note.dart
+++ b/lib/src/note/positioned_note.dart
@@ -163,7 +163,7 @@ final class PositionedNote
       other is PositionedNote && note == other.note && octave == other.octave;
 
   @override
-  int get hashCode => Object.hash(super.hashCode, octave);
+  int get hashCode => Object.hash(note, octave);
 
   @override
   int compareTo(PositionedNote other) => compareMultiple([
diff --git a/test/src/note/positioned_note_test.dart b/test/src/note/positioned_note_test.dart
index d5a4eaa8..f7545453 100644
--- a/test/src/note/positioned_note_test.dart
+++ b/test/src/note/positioned_note_test.dart
@@ -694,12 +694,14 @@ void main() {
         final collection = {
           Note.c.inOctave(4),
           Note.a.flat.inOctave(2),
+          Note.d.inOctave(4),
           Note.g.sharp.inOctave(5),
         };
         collection.addAll(collection);
         expect(collection.toList(), [
           Note.c.inOctave(4),
           Note.a.flat.inOctave(2),
+          Note.d.inOctave(4),
           Note.g.sharp.inOctave(5),
         ]);
       });