diff --git a/test/plugin/in_tail/test_io_handler.rb b/test/plugin/in_tail/test_io_handler.rb
index afe2530e77..9397006763 100644
--- a/test/plugin/in_tail/test_io_handler.rb
+++ b/test/plugin/in_tail/test_io_handler.rb
@@ -177,3 +177,4 @@ def create_watcher
     assert_equal text.bytesize, update_pos
     assert_equal 0, returned_lines.size
   end
+end