diff --git a/src/drf_yasg/app_settings.py b/src/drf_yasg/app_settings.py
index 6592d34b..5be07731 100644
--- a/src/drf_yasg/app_settings.py
+++ b/src/drf_yasg/app_settings.py
@@ -27,6 +27,8 @@
         'drf_yasg.inspectors.CoreAPICompatInspector',
     ],
 
+    'DEFAULT_JSON_ENCODER': 'rest_framework.utils.encoders.JSONEncoder',
+
     'EXCLUDED_MEDIA_TYPES': ['html'],
 
     'DEFAULT_INFO': None,
@@ -88,6 +90,7 @@
     'DEFAULT_FIELD_INSPECTORS',
     'DEFAULT_FILTER_INSPECTORS',
     'DEFAULT_PAGINATOR_INSPECTORS',
+    'DEFAULT_JSON_ENCODER'
     'DEFAULT_INFO',
 ]
 
diff --git a/src/drf_yasg/utils.py b/src/drf_yasg/utils.py
index 3784e4b6..527358ad 100644
--- a/src/drf_yasg/utils.py
+++ b/src/drf_yasg/utils.py
@@ -3,7 +3,6 @@
 import sys
 from collections import OrderedDict
 from decimal import Decimal
-
 from django.db import models
 from django.utils.encoding import force_str
 from rest_framework import serializers, status
@@ -457,7 +456,7 @@ def field_value_to_representation(field, value):
 
     # JSON roundtrip ensures that the value is valid JSON;
     # for example, sets and tuples get transformed into lists
-    return json.loads(json.dumps(value, cls=encoders.JSONEncoder))
+    return json.loads(json.dumps(value, cls=swagger_settings.DEFAULT_JSON_ENCODER))
 
 
 def get_field_default(field):