diff --git a/lib/jsonapi/relationship.rb b/lib/jsonapi/relationship.rb
index d03589e70..74c739bc8 100644
--- a/lib/jsonapi/relationship.rb
+++ b/lib/jsonapi/relationship.rb
@@ -1,6 +1,6 @@
 module JSONAPI
   class Relationship
-    attr_reader :acts_as_set, :foreign_key, :type, :options, :name,
+    attr_reader :acts_as_set, :foreign_key, :options, :name,
                 :class_name, :polymorphic, :always_include_linkage_data,
                 :parent_resource
 
@@ -29,6 +29,10 @@ def table_name
       @table_name ||= resource_klass._table_name
     end
 
+    def type
+      @type ||= resource_klass._type.to_sym
+    end
+
     def relation_name(options)
       case @relation_name
         when Symbol
@@ -61,7 +65,6 @@ class ToOne < Relationship
       def initialize(name, options = {})
         super
         @class_name = options.fetch(:class_name, name.to_s.camelize)
-        @type = class_name.underscore.pluralize.to_sym
         @foreign_key ||= "#{name}_id".to_sym
         @foreign_key_on = options.fetch(:foreign_key_on, :self)
       end
@@ -79,7 +82,6 @@ class ToMany < Relationship
       def initialize(name, options = {})
         super
         @class_name = options.fetch(:class_name, name.to_s.camelize.singularize)
-        @type = class_name.underscore.pluralize.to_sym
         @foreign_key ||= "#{name.to_s.singularize}_ids".to_sym
       end
     end