diff --git a/lib/sidekiq/extensions/generic_proxy.rb b/lib/sidekiq/extensions/generic_proxy.rb
index 69da3596..00fd2796 100644
--- a/lib/sidekiq/extensions/generic_proxy.rb
+++ b/lib/sidekiq/extensions/generic_proxy.rb
@@ -1,3 +1,5 @@
+require 'yaml'
+
 module Sidekiq
   module Extensions
     class Proxy < BasicObject