diff --git a/lib/fast_jsonapi/object_serializer.rb b/lib/fast_jsonapi/object_serializer.rb
index c9476e9..06fcbf6 100644
--- a/lib/fast_jsonapi/object_serializer.rb
+++ b/lib/fast_jsonapi/object_serializer.rb
@@ -49,7 +49,7 @@ module FastJsonapi
 
       return serializable_hash unless @resource
 
-      serializable_hash[:data] = self.class.record_hash(@resource, @fieldsets[self.class.record_type.to_sym], @params)
+      serializable_hash[:data] = self.class.record_hash(@resource, @fieldsets[self.class.record_type.to_sym], @includes, @params)
       serializable_hash[:included] = self.class.get_included_records(@resource, @includes, @known_included_objects, @fieldsets, @params) if @includes.present?
       serializable_hash
     end
@@ -61,7 +61,7 @@ module FastJsonapi
       included = []
       fieldset = @fieldsets[self.class.record_type.to_sym]
       @resource.each do |record|
-        data << self.class.record_hash(record, fieldset, @params)
+        data << self.class.record_hash(record, fieldset, @includes, @params)
         included.concat self.class.get_included_records(record, @includes, @known_included_objects, @fieldsets, @params) if @includes.present?
       end
 
diff --git a/lib/fast_jsonapi/relationship.rb b/lib/fast_jsonapi/relationship.rb
index f8a9bfd..5f82843 100644
--- a/lib/fast_jsonapi/relationship.rb
+++ b/lib/fast_jsonapi/relationship.rb
@@ -34,12 +34,12 @@ module FastJsonapi
       @lazy_load_data = lazy_load_data
     end
 
-    def serialize(record, serialization_params, output_hash)
+    def serialize(record, included, serialization_params, output_hash)
       if include_relationship?(record, serialization_params)
         empty_case = relationship_type == :has_many ? [] : nil
 
         output_hash[key] = {}
-        unless lazy_load_data
+        unless (lazy_load_data && !included)
           output_hash[key][:data] = ids_hash_from_record_and_relationship(record, serialization_params) || empty_case
         end
         add_links_hash(record, serialization_params, output_hash) if links.present?
diff --git a/lib/fast_jsonapi/serialization_core.rb b/lib/fast_jsonapi/serialization_core.rb
index 7dd1b76..1c9a3bc 100644
--- a/lib/fast_jsonapi/serialization_core.rb
+++ b/lib/fast_jsonapi/serialization_core.rb
@@ -51,13 +51,14 @@ module FastJsonapi
         end
       end
 
-      def relationships_hash(record, relationships = nil, fieldset = nil, params = {})
+      def relationships_hash(record, relationships = nil, fieldset = nil, includes_list = nil, params = {})
         relationships = relationships_to_serialize if relationships.nil?
         relationships = relationships.slice(*fieldset) if fieldset.present?
         relationships = {} if fieldset == []
 
-        relationships.each_with_object({}) do |(_k, relationship), hash|
-          relationship.serialize(record, params, hash)
+        relationships.each_with_object({}) do |(key, relationship), hash|
+          included = includes_list.present? && includes_list.include?(key)
+          relationship.serialize(record, included, params, hash)
         end
       end
 
@@ -65,23 +66,23 @@ module FastJsonapi
         meta_to_serialize.call(record, params)
       end
 
-      def record_hash(record, fieldset, params = {})
+      def record_hash(record, fieldset, includes_list, params = {})
         if cached
           record_hash = Rails.cache.fetch(record.cache_key, expires_in: cache_length, race_condition_ttl: race_condition_ttl) do
             temp_hash = id_hash(id_from_record(record), record_type, true)
             temp_hash[:attributes] = attributes_hash(record, fieldset, params) if attributes_to_serialize.present?
             temp_hash[:relationships] = {}
-            temp_hash[:relationships] = relationships_hash(record, cachable_relationships_to_serialize, fieldset, params) if cachable_relationships_to_serialize.present?
+            temp_hash[:relationships] = relationships_hash(record, cachable_relationships_to_serialize, fieldset, includes_list, params) if cachable_relationships_to_serialize.present?
             temp_hash[:links] = links_hash(record, params) if data_links.present?
             temp_hash
           end
-          record_hash[:relationships] = record_hash[:relationships].merge(relationships_hash(record, uncachable_relationships_to_serialize, fieldset, params)) if uncachable_relationships_to_serialize.present?
+          record_hash[:relationships] = record_hash[:relationships].merge(relationships_hash(record, uncachable_relationships_to_serialize, fieldset, includes_list, params)) if uncachable_relationships_to_serialize.present?
           record_hash[:meta] = meta_hash(record, params) if meta_to_serialize.present?
           record_hash
         else
           record_hash = id_hash(id_from_record(record), record_type, true)
           record_hash[:attributes] = attributes_hash(record, fieldset, params) if attributes_to_serialize.present?
-          record_hash[:relationships] = relationships_hash(record, nil, fieldset, params) if relationships_to_serialize.present?
+          record_hash[:relationships] = relationships_hash(record, nil, fieldset, includes_list, params) if relationships_to_serialize.present?
           record_hash[:links] = links_hash(record, params) if data_links.present?
           record_hash[:meta] = meta_hash(record, params) if meta_to_serialize.present?
           record_hash
@@ -150,7 +151,7 @@ module FastJsonapi
 
               known_included_objects[code] = inc_obj
 
-              included_records << serializer.record_hash(inc_obj, fieldsets[serializer.record_type], params)
+              included_records << serializer.record_hash(inc_obj, fieldsets[serializer.record_type], includes_list, params)
             end
           end
         end
diff --git a/spec/lib/object_serializer_relationship_links_spec.rb b/spec/lib/object_serializer_relationship_links_spec.rb
index e0d4848..e45f9d7 100644
--- a/spec/lib/object_serializer_relationship_links_spec.rb
+++ b/spec/lib/object_serializer_relationship_links_spec.rb
@@ -68,6 +68,24 @@ describe FastJsonapi::ObjectSerializer do
       end
     end
 
+    context "including lazy loaded relationships" do
+      before(:context) do
+        class LazyLoadingMovieSerializer < MovieSerializer
+          has_many :actors, lazy_load_data: true, links: {
+            related: :actors_relationship_url
+          }
+        end
+      end
+
+      let(:serializer) { LazyLoadingMovieSerializer.new(movie, include: [:actors]) }
+      let(:actor_hash) { hash[:data][:relationships][:actors] }
+
+      it "includes the :data key" do
+        expect(actor_hash).to be_present
+        expect(actor_hash).to have_key(:data)
+      end
+    end
+
     context "relationship links defined by a method on the object" do
       before(:context) do
         class Movie
diff --git a/spec/lib/serialization_core_spec.rb b/spec/lib/serialization_core_spec.rb
index adf33df..0d8d011 100644
--- a/spec/lib/serialization_core_spec.rb
+++ b/spec/lib/serialization_core_spec.rb
@@ -52,7 +52,7 @@ describe FastJsonapi::ObjectSerializer do
     end
 
     it 'returns correct hash when record_hash is called' do
-      record_hash = MovieSerializer.send(:record_hash, movie, nil)
+      record_hash = MovieSerializer.send(:record_hash, movie, nil, nil)
       expect(record_hash[:id]).to eq movie.id.to_s
       expect(record_hash[:type]).to eq MovieSerializer.record_type
       expect(record_hash).to have_key(:attributes) if MovieSerializer.attributes_to_serialize.present?