diff --git a/lib/core/note_serializer.dart b/lib/core/note_serializer.dart
index 8ad94c34..6d623584 100644
--- a/lib/core/note_serializer.dart
+++ b/lib/core/note_serializer.dart
@@ -172,7 +172,7 @@ class NoteSerializer implements NoteSerializerInterface {
         if (line.trim().isEmpty) {
           continue;
         }
-        startsWithH1 = line.startsWith('#');
+        startsWithH1 = line.startsWith('#') && !line.startsWith('##');
         break;
       }