1 files changed, 4 insertions, 2 deletions
diff --git a/railties/lib/rails/commands/server.rb b/railties/lib/rails/commands/server.rb
index d3ea441f8e..45d649ec31 100644
--- a/railties/lib/rails/commands/server.rb
+++ b/railties/lib/rails/commands/server.rb
@@ -133,11 +133,13 @@ module Rails
       def log_to_stdout
         wrapped_app # touch the app so the logger is set up
 
-        console = ActiveSupport::Logger.new($stdout)
+        console = ActiveSupport::Logger.new(STDOUT)
         console.formatter = Rails.logger.formatter
         console.level = Rails.logger.level
 
-        Rails.logger.extend(ActiveSupport::Logger.broadcast(console))
+        unless ActiveSupport::Logger.logger_outputs_to?(Rails.logger, STDOUT)
+          Rails.logger.extend(ActiveSupport::Logger.broadcast(console))
+        end
       end
   end
 end