diff --git a/lib/sidekiq.rb b/lib/sidekiq.rb
index 111d311d..827b0698 100644
--- a/lib/sidekiq.rb
+++ b/lib/sidekiq.rb
@@ -192,7 +192,7 @@ module Sidekiq
 
   def self.log_formatter=(log_formatter)
     @log_formatter = log_formatter
-    @logger = nil
+    logger.formatter = log_formatter
   end
 
   def self.logger