diff --git a/config/application.rb b/config/application.rb
index a803fa18e..9ad924f98 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -22,7 +22,7 @@ module Danbooru
     config.action_mailer.delivery_method = :smtp
     config.action_mailer.smtp_settings = {:enable_starttls_auto => false}
     config.action_mailer.perform_deliveries = true
-    config.log_tags = ["PID:#{Process.pid}"]
+    config.log_tags = [lambda {|req| "PID:#{Process.pid}"}]
   end
 end