diff --git a/ChangeLog b/ChangeLog
index dbc6813621..b4160e77c7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Sat Jan 31 00:07:49 2009  Tanaka Akira  <akr@fsij.org>
+
+	* lib/test/unit/assertions.rb
+	  (Test::Unit::Assertions#assert_nothing_raised): supress warning.
+	  [ruby-core:21312]
+
 Fri Jan 30 21:49:32 2009  Tanaka Akira  <akr@fsij.org>
 
 	* lib/pathname.rb (Pathname#realdirpath): new method based on the
diff --git a/lib/test/unit/assertions.rb b/lib/test/unit/assertions.rb
index 1358443285..5987d1adc7 100644
--- a/lib/test/unit/assertions.rb
+++ b/lib/test/unit/assertions.rb
@@ -28,7 +28,7 @@ module Test
           as = e.instance_of?(MiniTest::Assertion)
           if as
             ans = /\A#{Regexp.quote(__FILE__)}:#{line}:in /o
-            bt.reject! {|line| ans =~ line}
+            bt.reject! {|ln| ans =~ ln}
           end
           if ((args.empty? && !as) ||
               args.any? {|a| a.instance_of?(Module) ? e.is_a?(a) : e.class == a })