diff --git a/lib/graphql/client/hash_with_indifferent_access.rb b/lib/graphql/client/hash_with_indifferent_access.rb
index <HASH>..<HASH> 100644
--- a/lib/graphql/client/hash_with_indifferent_access.rb
+++ b/lib/graphql/client/hash_with_indifferent_access.rb
@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 require "active_support/inflector"
+require "forwardable"
 
 module GraphQL
   class Client
fix bug - missing require forwardable