diff --git a/lib/pact_broker/api/contracts/webhook_contract.rb b/lib/pact_broker/api/contracts/webhook_contract.rb
index aab3181c5..20eecc5aa 100644
--- a/lib/pact_broker/api/contracts/webhook_contract.rb
+++ b/lib/pact_broker/api/contracts/webhook_contract.rb
@@ -2,6 +2,7 @@
 require 'reform/form'
 require 'pact_broker/webhooks/check_host_whitelist'
 require 'pact_broker/webhooks/render'
+require 'pact_broker/pacticipants/service'
 
 module PactBroker
   module Api