diff --git a/lib/linkify/parser.ex b/lib/linkify/parser.ex
index d329e37..1b82f8e 100644
--- a/lib/linkify/parser.ex
+++ b/lib/linkify/parser.ex
@@ -41,7 +41,11 @@ defmodule Linkify.Parser do
     "ssb://"
   ]
 
-  @tlds "./priv/tlds.txt" |> File.read!() |> String.split("\n", trim: true) |> MapSet.new()
+  @tlds "./priv/tlds.txt"
+        |> File.read!()
+        |> String.split("\n", trim: true)
+        |> Enum.concat(["onion"])
+        |> MapSet.new()
 
   @default_opts %{
     url: true,
diff --git a/test/parser_test.exs b/test/parser_test.exs
index 8692f46..5d83a6a 100644
--- a/test/parser_test.exs
+++ b/test/parser_test.exs
@@ -304,7 +304,7 @@ defmodule Linkify.ParserTest do
       "misskey.loki"
     ]
 
-  def valid_emails, do: ["rms@ai.mit.edu", "vc@cock.li"]
+  def valid_emails, do: ["rms@ai.mit.edu", "vc@cock.li", "guardian@33y6fjyhs3phzfjj.onion"]
   def invalid_emails, do: ["rms[at]ai.mit.edu", "vc@cock", "xmpp:lain@trashserver.net"]
-  def valid_custom_tld_emails, do: ["guardian@33y6fjyhs3phzfjj.onion", "hi@company.null"]
+  def valid_custom_tld_emails, do: ["hi@company.null"]
 end