2 files changed, 10 insertions, 1 deletions
diff --git a/rest_framework/compat.py b/rest_framework/compat.py
index 5fc6c686..7664c400 100644
--- a/rest_framework/compat.py
+++ b/rest_framework/compat.py
@@ -10,6 +10,14 @@ except ImportError:
     import StringIO
 
 
+def get_concrete_model(model_cls):
+    try:
+        return model_cls._meta.concrete_model
+    except AttributeError:
+        # 1.3 does not include concrete model
+        return model_cls
+
+
 # First implementation of Django class-based views did not include head method
 # in base View class - https://code.djangoproject.com/ticket/15668
 if django.VERSION >= (1, 4):
diff --git a/rest_framework/serializers.py b/rest_framework/serializers.py
index 986d4225..bdb0f10a 100644
--- a/rest_framework/serializers.py
+++ b/rest_framework/serializers.py
@@ -4,6 +4,7 @@ import types
 from decimal import Decimal
 from django.core.serializers.base import DeserializedObject
 from django.utils.datastructures import SortedDict
+from rest_framework.compat import get_concrete_model
 from rest_framework.fields import *
 
 
@@ -299,7 +300,7 @@ class ModelSerializer(RelatedField, Serializer):
         else:
             cls = self.opts.model
 
-        opts = cls._meta.concrete_model._meta
+        opts = get_concrete_model(cls)._meta
         pk_field = opts.pk
         while pk_field.rel:
             pk_field = pk_field.rel.to._meta.pk