diff --git a/tool/downloader.rb b/tool/downloader.rb
index b1c1449cf8..7f5bdbe72d 100644
--- a/tool/downloader.rb
+++ b/tool/downloader.rb
@@ -119,6 +119,6 @@ if $0 == __FILE__
     end
   else
     abort "usage: #{$0} url name" unless ARGV.size == 2
-    Downloader.download(*ARGV, destdir, ims)
+    Downloader.download(ARGV[0], ARGV[1], destdir, ims)
   end
 end