--- a/mercurial/help.py	Tue Jul 11 08:52:55 2017 -0700
+++ b/mercurial/help.py	Fri Jul 14 14:22:40 2017 -0700
@@ -647,7 +647,7 @@
                 subtopic = remaining
             else:
                 section = remaining
-    textwidth = ui.configint('ui', 'textwidth', 78)
+    textwidth = ui.configint('ui', 'textwidth')
     termwidth = ui.termwidth() - 2
     if textwidth <= 0 or termwidth < textwidth:
         textwidth = termwidth