diff --git a/koans/about_exceptions.rb b/koans/about_exceptions.rb
index d228e48de..d745f961b 100644
--- a/koans/about_exceptions.rb
+++ b/koans/about_exceptions.rb
@@ -22,8 +22,8 @@ def test_rescue_clause
 
     assert_equal __, result
 
-    assert ex.is_a?(__)
-    assert_equal __, ex.message
+    assert_equal __, ex.is_a?(StandardError), "Should be a Standard Error"
+    assert_equal __, ex.is_a?(RuntimeError),  "Should be a Runtime Error"
 
     assert RuntimeError.ancestors.include?(StandardError),
       "RuntimeError is a subclass of StandardError"
diff --git a/src/about_exceptions.rb b/src/about_exceptions.rb
index a2efbb3a7..f24398249 100644
--- a/src/about_exceptions.rb
+++ b/src/about_exceptions.rb
@@ -22,8 +22,8 @@ def test_rescue_clause
 
     assert_equal __(:exception_handled), result
 
-    assert ex.is_a?(___(StandardError)), "Failure message."
-    assert ex.is_a?(___(RuntimeError)), "Failure message."
+    assert_equal __(true), ex.is_a?(StandardError), "Should be a Standard Error"
+    assert_equal __(true), ex.is_a?(RuntimeError),  "Should be a Runtime Error"
 
     assert RuntimeError.ancestors.include?(StandardError), # __
       "RuntimeError is a subclass of StandardError"