diff --git a/src/html_epub_preprocessor.py b/src/html_epub_preprocessor.py
index c25e38b..6108da3 100644
--- a/src/html_epub_preprocessor.py
+++ b/src/html_epub_preprocessor.py
@@ -323,7 +323,6 @@ def unwrap_structural_tags(body_tag):
     for s in body_tag.find_all("section"):
         could_be_unwrapped = True
         if s.attrs.get('class'):
-            _preserve_class_in_aside_tag(s)
             could_be_unwrapped = _preserve_class_in_section_tag(s)
         _add_span_to_save_ids_for_links(s)
         if could_be_unwrapped: