diff --git a/_plugins/glossary.rb b/_plugins/glossary.rb
index 5ed43526..4407fc6e 100644
--- a/_plugins/glossary.rb
+++ b/_plugins/glossary.rb
@@ -59,7 +59,7 @@ def pluralize(term)
     end
 
     def self.replace_glossary_terms(content, file_name)
-      doc = Nokogiri::HTML.fragment(content)
+      doc = Nokogiri::HTML5.parse(content)
 
       doc.traverse do |node|
         if node.text?