diff --git a/notes2web.py b/notes2web.py
index 820b8b1..b768357 100755
--- a/notes2web.py
+++ b/notes2web.py
@@ -237,6 +237,7 @@ def main(args):
                 article = frontmatter.load(fp)
 
             article['tags'] += get_inherited_tags(filename, args.notes)
+            article['tags'] = list(set(article['tags']))
             article['filehistory'] = filehistory
             article['licenseFull'] = notes_license
             html = pypandoc.convert_text(frontmatter.dumps(article), 'html', format='md', extra_args=[