diff --git a/ChangeLog b/ChangeLog
index e3abb9c821..5a9cdd0ee8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Mar 11 19:22:54 2013  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* test/mkmf/base.rb: class name conflict.
+
 Mon Mar 11 18:45:09 2013  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* enumerator.c (enumerator_with_index): try to convert given offset to
diff --git a/test/mkmf/base.rb b/test/mkmf/base.rb
index f4f00ed534..e1ae634537 100644
--- a/test/mkmf/base.rb
+++ b/test/mkmf/base.rb
@@ -8,7 +8,7 @@ RbConfig::CONFIG["extout"] = CONFIG["extout"] = $extout
 $INCFLAGS << " -I."
 $extout_prefix = "$(extout)$(target_prefix)/"
 
-class TestMkmf < Test::Unit::TestCase
+class TestMkmfBase < Test::Unit::TestCase
   MKMFLOG = proc {File.read("mkmf.log") rescue ""}
 
   class Capture