diff --git a/rest_framework_json_api/renderers.py b/rest_framework_json_api/renderers.py
index 427fdd9d..26362665 100644
--- a/rest_framework_json_api/renderers.py
+++ b/rest_framework_json_api/renderers.py
@@ -11,7 +11,7 @@
 from rest_framework.serializers import BaseSerializer, ListSerializer, Serializer
 from rest_framework.settings import api_settings
 
-from rest_framework_json_api import utils
+from rest_framework_json_api import serializers, utils
 
 
 class JSONRenderer(renderers.JSONRenderer):
@@ -535,12 +535,6 @@ def render(self, data, accepted_media_type=None, renderer_context=None):
 
         if serializer is not None:
 
-            # Get the serializer fields
-            fields = utils.get_serializer_fields(serializer)
-
-            # Determine if resource name must be resolved on each instance (polymorphic serializer)
-            force_type_resolution = getattr(serializer, '_poly_force_type_resolution', False)
-
             # Extract root meta for any type of serializer
             json_api_meta.update(self.extract_root_meta(serializer, serializer_data))
 
@@ -551,6 +545,18 @@ def render(self, data, accepted_media_type=None, renderer_context=None):
                     resource = serializer_data[position]  # Get current resource
                     resource_instance = serializer.instance[position]  # Get current instance
 
+                    if isinstance(serializer.child, serializers.PolymorphicModelSerializer):
+                        resource_serializer_class = serializer.child.\
+                            get_polymorphic_serializer_for_instance(resource_instance)()
+                    else:
+                        resource_serializer_class = serializer.child
+
+                    fields = utils.get_serializer_fields(resource_serializer_class)
+                    force_type_resolution = getattr(
+                        resource_serializer_class, '_poly_force_type_resolution',
+                        False
+                    )
+
                     json_resource_obj = self.build_json_resource_obj(
                         fields, resource, resource_instance, resource_name, force_type_resolution
                     )
@@ -565,6 +571,9 @@ def render(self, data, accepted_media_type=None, renderer_context=None):
                     if included:
                         json_api_included.extend(included)
             else:
+                fields = utils.get_serializer_fields(serializer)
+                force_type_resolution = getattr(serializer, '_poly_force_type_resolution', False)
+
                 resource_instance = serializer.instance
                 json_api_data = self.build_json_resource_obj(
                     fields, serializer_data, resource_instance, resource_name, force_type_resolution