Index: django/newforms/forms.py
===================================================================
--- django/newforms/forms.py	(revision 4680)
+++ django/newforms/forms.py	(working copy)
@@ -67,7 +67,7 @@
         # alter self.fields, we create self.fields here by copying base_fields.
         # Instances should always modify self.fields; they should not modify
         # self.base_fields.
-        self.fields = self.base_fields.copy()
+        self.fields = SortedDict(self.base_fields)
 
     def __unicode__(self):
         return self.as_table()