diff --git a/src/epub_postprocessor.py b/src/epub_postprocessor.py
index b7813bc..fbbc82c 100644
--- a/src/epub_postprocessor.py
+++ b/src/epub_postprocessor.py
@@ -225,6 +225,9 @@ class EpubPostprocessor:
                 if tag.attrs.get('class') == 'converter-chapter-mark':
                     continue
 
+                if tag.attrs.get('class') == 'footnote-element':
+                    continue
+
                 new_id = self._create_unique_id(href, tag.attrs['id'])
                 tag.attrs['id'] = new_id