diff -r ea878688221e -r fae1204603dc mercurial/commands.py
--- a/mercurial/commands.py	Fri Aug 26 15:26:44 2005 +0200
+++ b/mercurial/commands.py	Fri Aug 26 16:37:28 2005 +0200
@@ -779,7 +779,7 @@
     seqno = 0
     revs = list(revrange(ui, repo, changesets))
     total = len(revs)
-    revwidth = max(len(revs[0]), len(revs[-1]))
+    revwidth = max(map(len, revs))
     ui.note(len(revs) > 1 and "Exporting patches:\n" or "Exporting patch:\n")
     for cset in revs:
         seqno += 1