diff --git a/lib/grape-active_model_serializers/formatter.rb b/lib/grape-active_model_serializers/formatter.rb
index 2cb4723..53718c6 100644
--- a/lib/grape-active_model_serializers/formatter.rb
+++ b/lib/grape-active_model_serializers/formatter.rb
@@ -2,10 +2,8 @@ module Grape
   module Formatter
     module ActiveModelSerializers
       class << self
-        attr_reader :endpoint
-
         def call(resource, env)
-          @endpoint = env['api.endpoint']
+          endpoint = env['api.endpoint']
           options   = endpoint.namespace_options.merge(endpoint.route_options)
 
           if resource.respond_to?(:to_ary) && !resource.empty?