diff --git a/config/application.rb b/config/application.rb
index c57a8b59..3b47330f 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -20,6 +20,7 @@ Bundler.require(:assets) if ENV['DEPLOY'] == 'yes'
 # leads to "json_class" fallbacks for created threads. Maybe this will be fixed for future
 # rails versions. Current is: 6.1.3.1
 # For now make the getter Thread universal, not safe
+require 'json' # lessons learned
 module JSON
   def self.create_id
     'ruby_class'