diff --git a/lib/elixir_koans.ex b/lib/elixir_koans.ex
index dcf857f7..9ca0fa41 100644
--- a/lib/elixir_koans.ex
+++ b/lib/elixir_koans.ex
@@ -3,13 +3,11 @@ defmodule ElixirKoans do
   use Application
 
   def start(_type, _args) do
-    import Supervisor.Spec
-
     children = [
-      worker(Display, []),
-      worker(Tracker, []),
-      worker(Runner, []),
-      worker(Watcher, [])
+      {Display, []},
+      {Tracker, []},
+      {Runner, []},
+      {Watcher, []}
     ]
 
     opts = [strategy: :one_for_one, name: ElixirKoans.Supervisor]