diff --git a/lib/rails/html/sanitizer.rb b/lib/rails/html/sanitizer.rb
index a6c81f1..cdabbc2 100644
--- a/lib/rails/html/sanitizer.rb
+++ b/lib/rails/html/sanitizer.rb
@@ -39,7 +39,7 @@ def sanitize(html, options = {})
       module Parser
         module HTML4
           def parse_fragment(html)
-            Loofah.html4_fragment(html)
+            Loofah.fragment(html) # TODO: update to html4_fragment when we require Loofah >= 2.21
           end
         end