diff --git a/lib/meta/opennebula.ex b/lib/meta/opennebula.ex
index 2b50672..c50691c 100644
--- a/lib/meta/opennebula.ex
+++ b/lib/meta/opennebula.ex
@@ -11,12 +11,12 @@ defmodule Meta.OpenNebula do
   # OpenNebula daemon.
   @endpoint "/RPC2"
 
-  defp get_opennebula_config(key) do
-    Application.get_env(:meta, :opennebula, [])  |> Keyword.get(key)
+  defp get_opennebula_config(key, default \\ nil) do
+    Application.get_env(:meta, :opennebula, [])  |> Keyword.get(key, default)
   end
 
   def get_locations() do
-    get_opennebula_config(:locations)
+    get_opennebula_config(:locations, [])
     |> Enum.map(fn m -> Map.get(m, :name) end)
   end