diff --git a/django/newforms/models.py b/django/newforms/models.py
index eb6d01e787..c3938d9ae7 100644
--- a/django/newforms/models.py
+++ b/django/newforms/models.py
@@ -213,18 +213,19 @@ class ModelFormOptions(object):
 
 
 class ModelFormMetaclass(type):
-    def __new__(cls, name, bases, attrs,
-                formfield_callback=lambda f: f.formfield()):
+    def __new__(cls, name, bases, attrs):
+        formfield_callback = attrs.pop('formfield_callback',
+                lambda f: f.formfield())
         try:
             parents = [b for b in bases if issubclass(b, ModelForm)]
         except NameError:
             # We are defining ModelForm itself.
             parents = None
+        new_class = super(ModelFormMetaclass, cls).__new__(cls, name, bases,
+                attrs)
         if not parents:
-            return super(ModelFormMetaclass, cls).__new__(cls, name, bases,
-                    attrs)
+            return new_class
 
-        new_class = type.__new__(cls, name, bases, attrs)
         declared_fields = get_declared_fields(bases, attrs, False)
         opts = new_class._meta = ModelFormOptions(getattr(new_class, 'Meta', None))
         if opts.model: