diff --git a/extract_amendments.rb b/extract_amendments.rb
index 2c93865f4ac57d85dc199f0989c561c8954343a8..a565c3b12a25db4665216b1b672108064b9b69e7 100755
--- a/extract_amendments.rb
+++ b/extract_amendments.rb
@@ -8,9 +8,9 @@ require 'nokogiri'
 
 xml_dump_path = nil
 
-cli '--xml-dump' => lambda { |path| xml_dump_path = path }
+extra_args = cli '--xml-dump' => lambda { |path| xml_dump_path = path }
 
-opendocument_path = ARGV.first
+opendocument_path = extra_args.first
 raise "usage: #$0 <OpenDocument file>" unless opendocument_path
 
 xml = nil