diff --git a/dup.rb b/dup.rb
index 08c3a22..971511d 100755
--- a/dup.rb
+++ b/dup.rb
@@ -124,7 +124,7 @@ def action_run(container, file)
 		cmd = ["docker", "run"]
 
 		MAPPINGS.each do |mapping|
-			yml_name, cmd_name, inspect_name, options = *mapping
+			yml_name, cmd_name, options = *mapping
 			options ||= {}
 			if !data[yml_name]
 				if options[:type]==:name