diff --git a/tests/fakepatchtime.py b/tests/fakepatchtime.py
--- a/tests/fakepatchtime.py
+++ b/tests/fakepatchtime.py
@@ -6,9 +6,17 @@ from __future__ import absolute_import
 from mercurial import (
     extensions,
     patch as patchmod,
+    registrar,
     util,
 )
 
+configtable = {}
+configitem = registrar.configitem(configtable)
+
+configitem('fakepatchtime', 'fakenow',
+    default=None,
+)
+
 def internalpatch(orig, ui, repo, patchobj, strip,
                   prefix='', files=None,
                   eolmode='strict', similarity=0):