--- a/mercurial/logcmdutil.py	Sun Feb 25 16:40:41 2018 +0900
+++ b/mercurial/logcmdutil.py	Sun Feb 25 14:12:34 2018 +0900
@@ -889,7 +889,7 @@
         firstedge = next(edges)
         width = firstedge[2]
         displayer.show(ctx, copies=copies,
-                       _graphwidth=width, **pycompat.strkwargs(props))
+                       graphwidth=width, **pycompat.strkwargs(props))
         lines = displayer.hunk.pop(rev).split('\n')
         if not lines[-1]:
             del lines[-1]