diff --git a/lib/koans/04_atoms.ex b/lib/koans/04_atoms.ex
index a6a3199f..f0c5ea55 100644
--- a/lib/koans/04_atoms.ex
+++ b/lib/koans/04_atoms.ex
@@ -11,8 +11,8 @@ defmodule Atoms do
   koan "It is surprising to find out that booleans are atoms" do
     assert is_atom(true) == ___
     assert is_boolean(false) == ___
-    assert true == ___
-    assert false == ___
+    assert :true == ___
+    assert :false == ___
   end
 
   koan "Like booleans, the nil value is also an atom" do