diff --git a/mix.exs b/mix.exs
index 6eef406..1c47e1a 100644
--- a/mix.exs
+++ b/mix.exs
@@ -23,7 +23,7 @@ defmodule FeedParser.MixProject do
   # Run "mix help compile.app" to learn about applications.
   def application do
     [
-      extra_applications: [:logger]
+      extra_applications: [:logger, :xmerl]
     ]
   end