diff --git a/mix.exs b/mix.exs
index 63339e4..4140a76 100644
--- a/mix.exs
+++ b/mix.exs
@@ -19,7 +19,9 @@ defmodule UUID.Mixfile do
 
   # Application configuration.
   def application do
-    []
+    [
+      extra_applications: [:crypto],
+    ]
   end
 
   # List of dependencies.