mercurial/commands.py

--- a/mercurial/commands.py	Sun Apr 01 15:41:16 2018 -0700
+++ b/mercurial/commands.py	Mon Apr 02 08:46:07 2018 -0700
@@ -1460,7 +1460,7 @@
     r = hg.clone(ui, opts, source, dest,
                  pull=opts.get('pull'),
                  stream=opts.get('stream') or opts.get('uncompressed'),
-                 rev=opts.get('rev'),
+                 revs=opts.get('rev'),
                  update=opts.get('updaterev') or not opts.get('noupdate'),
                  branch=opts.get('branch'),
                  shareopts=opts.get('shareopts'))