diff --git a/ChangeLog b/ChangeLog
index c1def9dfae..b4622fcb72 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Oct 28 23:26:04 2013  Tanaka Akira  <akr@fsij.org>
+
+	* test/readline/test_readline.rb (teardown): Clear Readline.input and
+	  Readline.output.
+
 Mon Oct 28 21:35:31 2013  Tanaka Akira  <akr@fsij.org>
 
 	* ext/-test-/file/depend, ext/-test-/postponed_job/depend,
diff --git a/test/readline/test_readline.rb b/test/readline/test_readline.rb
index 57cf223a6c..4909205215 100644
--- a/test/readline/test_readline.rb
+++ b/test/readline/test_readline.rb
@@ -22,6 +22,8 @@ class TestReadline < Test::Unit::TestCase
       Readline.point = 0
     rescue NotImplementedError
     end
+    Readline.input = nil
+    Readline.output = nil
   end
 
   if !/EditLine/n.match(Readline::VERSION)