diff --git a/test/test_helper.rb b/test/test_helper.rb
index 9e3986d2..e73b878b 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -82,6 +82,7 @@ def signal_process(pid, signal, wait: nil, raise_on_missing: true)
       Thread.new do
         sleep(wait) if wait
         Process.kill(signal, pid)
+        sleep(wait) if wait
       rescue Errno::ESRCH
         raise if raise_on_missing
       end