diff --git a/AUTHORS b/AUTHORS
index a0032f5198..3ce1875d33 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -62,6 +62,7 @@ answer newbie questions, and generally made Django that much better:
     Ben <afternoon@uk2.net>
     Paul Bissex <http://e-scribe.com/>
     Simon Blanchard
+    David Blewett <david@dawninglight.net>
     Matt Boersma <ogghead@gmail.com>
     boobsd@gmail.com
     Andrew Brehaut <http://brehaut.net/blog>
diff --git a/django/newforms/formsets.py b/django/newforms/formsets.py
index 7637a093d9..38982b47de 100644
--- a/django/newforms/formsets.py
+++ b/django/newforms/formsets.py
@@ -21,7 +21,7 @@ class BaseFormSet(object):
     """A collection of instances of the same Form class."""
 
     def __init__(self, data=None, files=None, auto_id='id_%s', prefix=None, initial=None):
-        self.is_bound = data is not None and files is not None
+        self.is_bound = data is not None or files is not None
         self.prefix = prefix or 'form'
         self.auto_id = auto_id
         self.data = data