diff --git a/django/contrib/admin/widgets.py b/django/contrib/admin/widgets.py
index 0f567bdbdde..f06c5e421c6 100644
--- a/django/contrib/admin/widgets.py
+++ b/django/contrib/admin/widgets.py
@@ -203,7 +203,7 @@ class RelatedFieldWidgetWrapper(forms.Widget):
         # Backwards compatible check for whether a user can add related
         # objects.
         if can_add_related is None:
-            can_add_related = rel_to in self.admin_site._registry
+            can_add_related = rel.to in admin_site._registry
         self.can_add_related = can_add_related
         # so we can check if the related object is registered with this AdminSite
         self.admin_site = admin_site
diff --git a/tests/regressiontests/admin_widgets/models.py b/tests/regressiontests/admin_widgets/models.py
index 6d51746041f..c187584996f 100644
--- a/tests/regressiontests/admin_widgets/models.py
+++ b/tests/regressiontests/admin_widgets/models.py
@@ -1,8 +1,9 @@
 from django.db import models
 from django.contrib.auth.models import User
 
-class MyFileField(models.FileField): 
-    pass 
+
+class MyFileField(models.FileField):
+    pass
 
 class Member(models.Model):
     name = models.CharField(max_length=100)
diff --git a/tests/regressiontests/admin_widgets/tests.py b/tests/regressiontests/admin_widgets/tests.py
index 4f9abb6b594..489013fea3d 100644
--- a/tests/regressiontests/admin_widgets/tests.py
+++ b/tests/regressiontests/admin_widgets/tests.py
@@ -6,9 +6,9 @@ from django import forms
 from django.conf import settings
 from django.contrib import admin
 from django.contrib.admin import widgets
-from django.contrib.admin.widgets import FilteredSelectMultiple, AdminSplitDateTime
-from django.contrib.admin.widgets import (AdminFileWidget, ForeignKeyRawIdWidget,
-    ManyToManyRawIdWidget)
+from django.contrib.admin.widgets import (FilteredSelectMultiple,
+    AdminSplitDateTime, AdminFileWidget, ForeignKeyRawIdWidget, AdminRadioSelect,
+    RelatedFieldWidgetWrapper, ManyToManyRawIdWidget)
 from django.core.files.storage import default_storage
 from django.core.files.uploadedfile import SimpleUploadedFile
 from django.db.models import DateField
@@ -31,7 +31,8 @@ class AdminFormfieldForDBFieldTests(TestCase):
         and verify that the returned formfield is appropriate.
         """
         # Override any settings on the model admin
-        class MyModelAdmin(admin.ModelAdmin): pass
+        class MyModelAdmin(admin.ModelAdmin):
+            pass
         for k in admin_overrides:
             setattr(MyModelAdmin, k, admin_overrides[k])
 
@@ -314,3 +315,11 @@ class ManyToManyRawIdWidgetTest(DjangoTestCase):
         self.assertEqual(w._has_changed([1, 2], [u'1', u'2']), False)
         self.assertEqual(w._has_changed([1, 2], [u'1']), True)
         self.assertEqual(w._has_changed([1, 2], [u'1', u'3']), True)
+
+class RelatedFieldWidgetWrapperTests(DjangoTestCase):
+    def test_no_can_add_related(self):
+        rel = models.Inventory._meta.get_field('parent').rel
+        w = AdminRadioSelect()
+        # Used to fail with a name error.
+        w = RelatedFieldWidgetWrapper(w, rel, admin.site)
+        self.assertFalse(w.can_add_related)