diff --git a/dup.rb b/dup.rb
index 51b4bbe..9e7e506 100755
--- a/dup.rb
+++ b/dup.rb
@@ -28,6 +28,7 @@ MAPPINGS = [
 	['labels', '--label', lambda{|c,i| l=Hash[c.Config.Labels.to_h.delete_if{|k,v| i.Config.Labels[k]==v rescue false}.map{|k,v| [k.to_s, v]}] ; l}],
 	['hostname', '--hostname'],
 	['working_dir', '--workdir', lambda{|c,i| (wd=c.Config.WorkingDir) == i.Config.WorkingDir ? nil : wd}],
+	['init', '--init', lambda{|c,i| c.Config.Init}, {:type=>:switch}],
 	['image', nil, lambda{|c,i| c.Config.Image}],
 	['command', nil, lambda{|c,i| (cmd=c.Config.Cmd.join(" ") rescue nil) == (i.Config.Cmd.join(" ") rescue nil)? nil : cmd}, {:escape=>false}]
 ]