diff --git a/lib/grape-active_model_serializers/formatter.rb b/lib/grape-active_model_serializers/formatter.rb
index cd86dda..824a681 100644
--- a/lib/grape-active_model_serializers/formatter.rb
+++ b/lib/grape-active_model_serializers/formatter.rb
@@ -1,5 +1,14 @@
 require 'active_record'
-require 'pry'
+
+# Make the Grape::Endpoint quiack like a controller
+module Grape
+  class Endpoint
+    def default_serializer_options; end
+    def serialization_scope; end
+    def _serialization_scope; end
+    def url_options; end
+  end
+end
 
 module Grape
   module Formatter
@@ -18,7 +27,7 @@ module Grape
           route_options     = endpoint.options[:route_options]
           options           = namespace_options.merge(route_options)
 
-          serializer = serializer(endpoint, resource, options)
+          serializer = ::ActiveModel::Serializer.build_json(endpoint, resource, options)
 
           if serializer
             serializer.to_json
@@ -26,34 +35,6 @@ module Grape
             Grape::Formatter::Json.call resource, env
           end
         end
-
-        private
-
-        def serializer(endpoint, resource, options={})
-          serializer = options.delete(:serializer) ||
-            (resource.respond_to?(:active_model_serializer) &&
-             resource.active_model_serializer)
-
-          return serializer unless serializer
-
-          if resource.respond_to?(:to_ary)
-            unless serializer <= ActiveModel::ArraySerializer
-              raise ArgumentError.new("#{serializer.name} is not an ArraySerializer. " +
-                                      "You may want to use the :each_serializer option instead.")
-            end
-
-            if options[:root] != false && serializer.root != false
-              # the serializer for an Array is ActiveModel::ArraySerializer
-              options[:root] ||= serializer.root || resource.first.class.name.underscore.pluralize
-            end
-          end
-
-          # options[:scope] = controller.serialization_scope unless options.has_key?(:scope)
-          # options[:scope_name] = controller._serialization_scope
-          # options[:url_options] = controller.url_options
-
-          serializer.new(resource, options)
-        end
       end
     end
   end