diff -r 6d968cd40961 -r 2dc5ae953c4a mercurial/commands.py
--- a/mercurial/commands.py	Sat May 16 20:38:53 2020 +0200
+++ b/mercurial/commands.py	Tue Jun 02 20:40:06 2020 +0900
@@ -3168,7 +3168,7 @@
     if opts.get(b'no_commit'):
         statedata[b'no_commit'] = True
     if opts.get(b'base'):
-        statedata[b'base'] = True
+        statedata[b'base'] = opts[b'base']
     for pos, ctx in enumerate(repo.set(b"%ld", revs)):
         desc = b'%d:%s "%s"' % (
             ctx.rev(),