diff --git a/test/readline/test_readline.rb b/test/readline/test_readline.rb
index d220d142b3..b047c354c6 100644
--- a/test/readline/test_readline.rb
+++ b/test/readline/test_readline.rb
@@ -806,6 +806,10 @@ class TestRelineAsReadline < Test::Unit::TestCase
     super
   end
 
+  def teardown
+    Reline.test_reset
+  end
+
   def get_default_internal_encoding
     if RUBY_PLATFORM =~ /mswin|mingw/
       Encoding.default_internal || Encoding::UTF_8
diff --git a/test/readline/test_readline_history.rb b/test/readline/test_readline_history.rb
index 1a4404c268..3531c384b4 100644
--- a/test/readline/test_readline_history.rb
+++ b/test/readline/test_readline_history.rb
@@ -277,6 +277,10 @@ class TestRelineAsReadlineHistory < Test::Unit::TestCase
     super
   end
 
+  def teardown
+    Reline.test_reset
+  end
+
   def get_default_internal_encoding
     if RUBY_PLATFORM =~ /mswin|mingw/
       Encoding.default_internal || Encoding::UTF_8