diff -r 685cf59a134f -r 79f8f032c706 mercurial/configitems.py
--- a/mercurial/configitems.py	Sun Jan 06 15:25:10 2019 -0500
+++ b/mercurial/configitems.py	Fri Jan 04 20:27:17 2019 +0530
@@ -991,6 +991,9 @@
     default='1MB',
     alias=[('experimental', 'mmapindexthreshold')],
 )
+coreconfigitem('rewrite', 'update-timestamp',
+    default=False,
+)
 coreconfigitem('storage', 'new-repo-backend',
     default='revlogv1',
 )