diff --git a/config.ru b/config.ru
index 1e3945b00e0d6bdae935e60f5f01e17af07506e5..f0d80e4e03e4fe5f58fec506a0263031460ed021 100644
--- a/config.ru
+++ b/config.ru
@@ -15,6 +15,7 @@ if ENV["RACK_ENV"] == "development"
 end
 
 require_relative "lib/electrum"
+require_relative "lib/transaction"
 
 require "sentry-ruby"
 Sentry.init do |config|