diff -r a53b87e20132 -r 14cd5290c4e6 mercurial/commands.py
--- a/mercurial/commands.py	Tue Apr 03 12:16:19 2018 +0530
+++ b/mercurial/commands.py	Sat Mar 31 23:49:58 2018 +0530
@@ -253,8 +253,9 @@
         raise error.Abort(_('similarity must be a number'))
     if sim < 0 or sim > 100:
         raise error.Abort(_('similarity must be between 0 and 100'))
+    opts['similarity'] = sim / 100.0
     matcher = scmutil.match(repo[None], pats, opts)
-    return scmutil.addremove(repo, matcher, "", opts, similarity=sim / 100.0)
+    return scmutil.addremove(repo, matcher, "", opts)
 
 @command('^annotate|blame',
     [('r', 'rev', '', _('annotate the specified revision'), _('REV')),