diff --git a/browser/form.py b/browser/form.py
index 4c94d17..da608b0 100755
--- a/browser/form.py
+++ b/browser/form.py
@@ -366,6 +366,7 @@ class CreateObjectForm(ObjectForm):
     def adapted(self):
         ad = self.typeInterface(Resource())
         ad.storageName = 'unknown'  # hack for file objects: don't try to retrieve data
+        ad.__is_dummy__ = True
         ad.__type__ = adapted(self.typeConcept)
         return ad