1 files changed, 2 insertions, 2 deletions
diff --git a/rest_framework/serializers.py b/rest_framework/serializers.py
index 4fb802a7..d02e1ada 100644
--- a/rest_framework/serializers.py
+++ b/rest_framework/serializers.py
@@ -443,7 +443,7 @@ class ModelSerializer(Serializer):
         # TODO: filter queryset using:
         # .using(db).complex_filter(self.rel.limit_choices_to)
         kwargs = {
-            'null': model_field.null or model_field.blank,
+            'required': not(model_field.null or model_field.blank),
             'queryset': model_field.rel.to._default_manager
         }
 
@@ -633,7 +633,7 @@ class HyperlinkedModelSerializer(ModelSerializer):
         # .using(db).complex_filter(self.rel.limit_choices_to)
         rel = model_field.rel.to
         kwargs = {
-            'null': model_field.null,
+            'required': not(model_field.null or model_field.blank),
             'queryset': rel._default_manager,
             'view_name': self._get_default_view_name(rel)
         }