diff --git a/koans/about_message_passing.rb b/koans/about_message_passing.rb
index d396c80..9932e8f 100644
--- a/koans/about_message_passing.rb
+++ b/koans/about_message_passing.rb
@@ -72,7 +72,7 @@ class AboutMessagePassing < EdgeCase::Koan
   def test_sending_undefined_messages_to_a_typical_object_results_in_errors
     typical = TypicalObject.new
 
-    assert_raise(___) do
+    exception = assert_raise(___) do
       typical.foobar
     end
     assert_match(/foobar/, exception.message)