diff --git a/ubuntutools/sponsor_patch/patch.py b/ubuntutools/sponsor_patch/patch.py
index fd2575d..f46284c 100644
--- a/ubuntutools/sponsor_patch/patch.py
+++ b/ubuntutools/sponsor_patch/patch.py
@@ -21,6 +21,7 @@ import re
 from ubuntutools import subprocess
 from ubuntutools.logger import Logger
 from ubuntutools.sponsor_patch.question import ask_for_manual_fixing
+from functools import reduce
 
 class Patch(object):
     """This object represents a patch that can be downloaded from Launchpad."""