diff -r 44fd4cfc6c0a -r 786289423e97 mercurial/hgweb/webutil.py
--- a/mercurial/hgweb/webutil.py	Mon Dec 18 15:18:37 2017 -0800
+++ b/mercurial/hgweb/webutil.py	Tue Dec 19 16:27:24 2017 -0500
@@ -547,7 +547,8 @@
 def diffstatgen(ctx, basectx):
     '''Generator function that provides the diffstat data.'''
 
-    stats = patch.diffstatdata(util.iterlines(ctx.diff(basectx)))
+    stats = patch.diffstatdata(
+        util.iterlines(ctx.diff(basectx, noprefix=False)))
     maxname, maxtotal, addtotal, removetotal, binary = patch.diffstatsum(stats)
     while True:
         yield stats, maxname, maxtotal, addtotal, removetotal, binary