diff --git a/rb/lib/selenium/webdriver/common/service_manager.rb b/rb/lib/selenium/webdriver/common/service_manager.rb
index 92461a7081c9c..e4c416bd9e6bd 100644
--- a/rb/lib/selenium/webdriver/common/service_manager.rb
+++ b/rb/lib/selenium/webdriver/common/service_manager.rb
@@ -80,8 +80,8 @@ def uri
       def build_process(*command)
         WebDriver.logger.debug("Executing Process #{command}", id: :driver_service)
         @process = ChildProcess.build(*command)
-        @process.io = @io
-        @process.io ||= WebDriver.logger.io if WebDriver.logger.debug?
+        @io ||= WebDriver.logger.io if WebDriver.logger.debug?
+        @process.io = @io if @io
 
         @process
       end