diff --git a/ruby/lib/minitest/queue.rb b/ruby/lib/minitest/queue.rb
index 8450ec99..6f8c6c39 100644
--- a/ruby/lib/minitest/queue.rb
+++ b/ruby/lib/minitest/queue.rb
@@ -271,6 +271,7 @@ def run_from_queue(reporter, *)
       queue.report_worker_error(error)
       puts red("This worker exited because of an uncaught application error:")
       puts red("#{error.class}: #{error.message}")
+      puts red("#{error.backtrace}")
       exit!(42)
     end
   end