diff --git a/sugar/activity/bundlebuilder.py b/sugar/activity/bundlebuilder.py
index cf7dfcd0..8b221476 100644
--- a/sugar/activity/bundlebuilder.py
+++ b/sugar/activity/bundlebuilder.py
@@ -54,7 +54,7 @@ class _DefaultFileList(list):
 
         news_file = os.path.join(_get_source_path(), 'NEWS')
         if not os.path.isfile(news_file):
-            f = f.open('w')
+            f = open('w')
             f.write('')
             f.close()