diff --git a/django/forms/models.py b/django/forms/models.py
index 61ff8e4dcc..3f7621e5e7 100644
--- a/django/forms/models.py
+++ b/django/forms/models.py
@@ -910,6 +910,9 @@ class ModelChoiceIterator(object):
             for obj in self.queryset.all():
                 yield self.choice(obj)
 
+    def __len__(self):
+        return len(self.queryset)
+
     def choice(self, obj):
         if self.field.to_field_name:
             key = obj.serializable_value(self.field.to_field_name)
diff --git a/tests/regressiontests/model_forms_regress/tests.py b/tests/regressiontests/model_forms_regress/tests.py
index 85e284b639..f8b6511140 100644
--- a/tests/regressiontests/model_forms_regress/tests.py
+++ b/tests/regressiontests/model_forms_regress/tests.py
@@ -100,4 +100,16 @@ class CustomFieldSaveTests(TestCase):
         # It's enough that the form saves without error -- the custom save routine will
         # generate an AssertionError if it is called more than once during save.
         form = CFFForm(data = {'f': None})
-        form.save()
\ No newline at end of file
+        form.save()
+
+class ModelChoiceIteratorTests(TestCase):
+    def test_len(self):
+        class Form(forms.ModelForm):
+            class Meta:
+                model = Article
+                fields = ["publications"]
+        
+        Publication.objects.create(title="Pravda",
+            date_published=date(1991, 8, 22))
+        f = Form()
+        self.assertEqual(len(f.fields["publications"].choices), 1)