Index: django/views/generic/edit.py
===================================================================
--- django/views/generic/edit.py	(revision 16307)
+++ django/views/generic/edit.py	(working copy)
@@ -19,7 +19,7 @@
         """
         Returns the initial data to use for forms on this view.
         """
-        return self.initial
+        return self.initial.copy()
 
     def get_form_class(self):
         """