diff --git a/actioncable/test/test_helper.rb b/actioncable/test/test_helper.rb
index f5b9ebf517..c924f1e475 100644
--- a/actioncable/test/test_helper.rb
+++ b/actioncable/test/test_helper.rb
@@ -17,7 +17,7 @@ Dir[File.expand_path("stubs/*.rb", __dir__)].each { |file| require file }
 
 # Set test adapter and logger
 ActionCable.server.config.cable = { "adapter" => "test" }
-ActionCable.server.config.logger = Logger.new(StringIO.new).tap { |l| l.level = Logger::UNKNOWN }
+ActionCable.server.config.logger = Logger.new(nil)
 
 class ActionCable::TestCase < ActiveSupport::TestCase
   include ActiveSupport::Testing::MethodCallAssertions