diff --git a/django/contrib/formtools/preview.py b/django/contrib/formtools/preview.py
index 2e4fb92cda..bd0ce5cbb7 100644
--- a/django/contrib/formtools/preview.py
+++ b/django/contrib/formtools/preview.py
@@ -109,7 +109,7 @@ class FormPreview(object):
         data = [(bf.name, bf.data) for bf in form] + [settings.SECRET_KEY]
         # Use HIGHEST_PROTOCOL because it's the most efficient. It requires
         # Python 2.3, but Django requires 2.3 anyway, so that's OK.
-        pickled = pickle.dumps(data, protocol=pickle.HIGHEST_PROTOCOL)
+        pickled = pickle.dumps(data, pickle.HIGHEST_PROTOCOL)
         return md5.new(pickled).hexdigest()
 
     def failed_hash(self, request):