diff --git a/activesupport/lib/active_support/broadcast_logger.rb b/activesupport/lib/active_support/broadcast_logger.rb
index 6423ab342bb3a..4d707f7a87784 100644
--- a/activesupport/lib/active_support/broadcast_logger.rb
+++ b/activesupport/lib/active_support/broadcast_logger.rb
@@ -76,7 +76,6 @@ class BroadcastLogger
 
     # Returns all the logger that are part of this broadcast.
     attr_reader :broadcasts
-    attr_reader :formatter
     attr_accessor :progname
 
     def initialize(*loggers)
@@ -110,6 +109,7 @@ def stop_broadcasting_to(logger)
       << log add debug info warn error fatal unknown
       debug! info! warn! error! fatal!
       level= sev_threshold= local_level local_level= close
+      formatter formatter=
     ]
     LOGGER_METHODS.each do |method|
       class_eval <<-RUBY, __FILE__, __LINE__ + 1
@@ -124,12 +124,6 @@ def level
       @broadcasts.map(&:level).min
     end
 
-    def formatter=(formatter)
-      dispatch(:formatter=, formatter)
-
-      @formatter = formatter
-    end
-
     # +True+ if the log level allows entries with severity Logger::DEBUG to be written
     # to at least one broadcast. +False+ otherwise.
     def debug?
@@ -163,7 +157,6 @@ def fatal?
     def initialize_copy(other)
       @broadcasts = []
       @progname = other.progname.dup
-      @formatter = other.formatter.dup
 
       broadcast_to(*other.broadcasts.map(&:dup))
     end
diff --git a/railties/lib/rails/application/bootstrap.rb b/railties/lib/rails/application/bootstrap.rb
index 95295522e7e85..eff76f9d8605a 100644
--- a/railties/lib/rails/application/bootstrap.rb
+++ b/railties/lib/rails/application/bootstrap.rb
@@ -60,9 +60,7 @@ module Bootstrap
           end
         else
           Rails.logger.level = ActiveSupport::Logger.const_get(config.log_level.to_s.upcase)
-          broadcast_logger = ActiveSupport::BroadcastLogger.new(Rails.logger)
-          broadcast_logger.formatter = Rails.logger.formatter
-          Rails.logger = broadcast_logger
+          Rails.logger = ActiveSupport::BroadcastLogger.new(Rails.logger)
         end
       end