diff --git a/activesupport/test/core_ext/duration_test.rb b/activesupport/test/core_ext/duration_test.rb
index 55b4df9f80..594252d581 100644
--- a/activesupport/test/core_ext/duration_test.rb
+++ b/activesupport/test/core_ext/duration_test.rb
@@ -10,11 +10,12 @@ class DurationTest < Test::Unit::TestCase
     assert_equal '7 days',                          1.week.inspect
     assert_equal '14 days',                         1.fortnight.inspect
   end
-  
+
   def test_minus_with_duration_does_not_break_subtraction_of_date_from_date
     assert_nothing_raised { Date.today - Date.today }
   end
-  
+
+  # FIXME: ruby 1.9
   def test_plus_with_time
     assert_equal 1 + 1.second, 1.second + 1, "Duration + Numeric should == Numeric + Duration"
   end