diff --git a/mercurial/patch.py b/mercurial/patch.py
--- a/mercurial/patch.py
+++ b/mercurial/patch.py
@@ -2829,7 +2829,7 @@
         # If diffstat runs out of room it doesn't print anything,
         # which isn't very useful, so always print at least one + or -
         # if there were at least some changes.
-        return max(i * graphwidth // maxtotal, int(bool(i)))
+        return max(i * graphwidth // max(diffstatsum(stats)), int(bool(i)))
 
     for filename, adds, removes, isbinary in stats:
         if isbinary: