diff --git a/lib/outlook/translators.ex b/lib/outlook/translators.ex
index bf7c844..30ebc69 100644
--- a/lib/outlook/translators.ex
+++ b/lib/outlook/translators.ex
@@ -83,7 +83,7 @@ defmodule Outlook.Translators do
     |> IO.iodata_to_binary()
   end
 
-  def process_translation(translation, tunit_ids) do
+  defp process_translation(translation, tunit_ids) do
     tunit_map = translation
     |> Floki.parse_fragment!
     |> Floki.find("tunit")