diff --git a/lib/outlook/translations/translation_units_map.ex b/lib/outlook/translations/translation_units_map.ex
index 74a52be..53dc335 100644
--- a/lib/outlook/translations/translation_units_map.ex
+++ b/lib/outlook/translations/translation_units_map.ex
@@ -23,7 +23,7 @@ defmodule Outlook.Translations.TranslationUnitsMap do
 
   def dump(tumap) when is_map(tumap) do
     serialized_map = for {key, val} <- tumap do
-      {key, Jason.encode!(val |> Map.delete(:eph))}
+      {key, Jason.encode!(val |> Map.put(:eph, %{}))}
     end
     |> Enum.into(%{})
    {:ok, serialized_map}