diff --git a/test/irb/test_history.rb b/test/irb/test_history.rb
index b9f3955249..ea220a2dd3 100644
--- a/test/irb/test_history.rb
+++ b/test/irb/test_history.rb
@@ -27,6 +27,7 @@ module TestIRB
       ENV["IRBRC"] = @backup_irbrc
       Encoding.default_external = @backup_default_external
       $VERBOSE = @original_verbose
+      FileUtils.rm_rf(@tmpdir)
     end
 
     class TestInputMethodWithRelineHistory < TestInputMethod