diff --git a/ChangeLog b/ChangeLog
index 741980e6d2..881c9f7c7d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,7 @@
-Sat Dec 25 17:32:24 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Sat Dec 25 17:33:55 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* test/csv/base.rb (TestCSV.with_diffrent_ofs): give name to
+	  anonymous classes.
 
 	* lib/csv.rb (CSV#init_separators): use IO#gets with length
 	  parameter to get rid of wrong convertion.
diff --git a/test/csv/base.rb b/test/csv/base.rb
index c0f5bd990b..1f83bab4a9 100644
--- a/test/csv/base.rb
+++ b/test/csv/base.rb
@@ -15,6 +15,6 @@ class TestCSV < Test::Unit::TestCase
   end
 
   def self.with_diffrent_ofs
-    Class.new(self).class_eval {include DifferentOFS}
+    const_set(:DifferentOFS, Class.new(self).class_eval {include DifferentOFS}).name
   end
 end