diff --git a/django/core/serializers/base.py b/django/core/serializers/base.py
index e4bba1d240..dbe7787726 100644
--- a/django/core/serializers/base.py
+++ b/django/core/serializers/base.py
@@ -43,8 +43,8 @@ class Serializer(object):
             self.start_object(obj)
             # Use the concrete parent class' _meta instead of the object's _meta
             # This is to avoid local_fields problems for proxy models. Refs #17717.
-            concrete_class = obj._meta.proxy_for_model or obj.__class__
-            for field in concrete_class._meta.local_fields:
+            concrete_model = obj._meta.concrete_model
+            for field in concrete_model._meta.local_fields:
                 if field.serialize:
                     if field.rel is None:
                         if self.selected_fields is None or field.attname in self.selected_fields:
@@ -52,7 +52,7 @@ class Serializer(object):
                     else:
                         if self.selected_fields is None or field.attname[:-3] in self.selected_fields:
                             self.handle_fk_field(obj, field)
-            for field in concrete_class._meta.many_to_many:
+            for field in concrete_model._meta.many_to_many:
                 if field.serialize:
                     if self.selected_fields is None or field.attname in self.selected_fields:
                         self.handle_m2m_field(obj, field)
diff --git a/tests/regressiontests/serializers_regress/models.py b/tests/regressiontests/serializers_regress/models.py
index 9381349a61..f366f90806 100644
--- a/tests/regressiontests/serializers_regress/models.py
+++ b/tests/regressiontests/serializers_regress/models.py
@@ -263,6 +263,10 @@ class ProxyBaseModel(BaseModel):
     class Meta:
         proxy = True
 
+class ProxyProxyBaseModel(ProxyBaseModel):
+    class Meta:
+        proxy = True
+
 class LengthModel(models.Model):
     data = models.IntegerField()
 
diff --git a/tests/regressiontests/serializers_regress/tests.py b/tests/regressiontests/serializers_regress/tests.py
index d8c5faba14..704e34b8ba 100644
--- a/tests/regressiontests/serializers_regress/tests.py
+++ b/tests/regressiontests/serializers_regress/tests.py
@@ -41,8 +41,8 @@ from .models import (BooleanData, CharData, DateData, DateTimeData, EmailData,
     GenericIPAddressPKData, PhonePKData, PositiveIntegerPKData,
     PositiveSmallIntegerPKData, SlugPKData, SmallPKData, USStatePKData,
     AutoNowDateTimeData, ModifyingSaveData, InheritAbstractModel, BaseModel,
-    ExplicitInheritBaseModel, InheritBaseModel, ProxyBaseModel, BigIntegerData,
-    LengthModel, Tag, ComplexModel)
+    ExplicitInheritBaseModel, InheritBaseModel, ProxyBaseModel,
+    ProxyProxyBaseModel, BigIntegerData, LengthModel, Tag, ComplexModel)
 
 # A set of functions that can be used to recreate
 # test data objects of various kinds.
@@ -410,11 +410,14 @@ class SerializerTests(TestCase):
 
     def test_serialize_proxy_model(self):
         BaseModel.objects.create(parent_data=1)
-        base_objects  = BaseModel.objects.all()
+        base_objects = BaseModel.objects.all()
         proxy_objects = ProxyBaseModel.objects.all()
-        base_data  = serializers.serialize("json", base_objects)
+        proxy_proxy_objects = ProxyProxyBaseModel.objects.all()
+        base_data = serializers.serialize("json", base_objects)
         proxy_data = serializers.serialize("json", proxy_objects)
+        proxy_proxy_data = serializers.serialize("json", proxy_proxy_objects)
         self.assertEqual(base_data, proxy_data.replace('proxy', ''))
+        self.assertEqual(base_data, proxy_proxy_data.replace('proxy', ''))
 
 
 def serializerTest(format, self):