diff --git a/lib/wayback_machine_downloader/to_regex.rb b/lib/wayback_machine_downloader/to_regex.rb
index a059ccf..d9f0a67 100644
--- a/lib/wayback_machine_downloader/to_regex.rb
+++ b/lib/wayback_machine_downloader/to_regex.rb
@@ -25,7 +25,7 @@ module ToRegex
     # @option options [true,false] :lang /foo/[nesu]
     def to_regex(options = {})
       if args = as_regexp(options)
-        ::Regexp.new *args
+        ::Regexp.new(*args)
       end
     end