diff --git a/tool/downloader.rb b/tool/downloader.rb
index c6f6c4701c..640a55ab45 100644
--- a/tool/downloader.rb
+++ b/tool/downloader.rb
@@ -277,6 +277,8 @@ class Downloader
         $stderr.puts "retrying #{e.class} (#{e.message}) after #{times ** 2} seconds..."
         sleep(times ** 2)
         retry
+      else
+        raise
       end
     end
   end