1 files changed, 5 insertions, 1 deletions
diff --git a/test/ruby/hooks/multiple.rb b/test/ruby/hooks/multiple.rb
index 295b46a9..b1b659a5 100644
--- a/test/ruby/hooks/multiple.rb
+++ b/test/ruby/hooks/multiple.rb
@@ -1,9 +1,13 @@
 require 'securerandom'
 
+@mutex = Mutex.new
+
 on_worker_boot do
     File.write("./cookie_worker_boot.#{SecureRandom.hex}", "worker booted")
 end
 
 on_thread_boot do
-    File.write("./cookie_thread_boot.#{SecureRandom.hex}", "thread booted")
+    @mutex.synchronize do
+        File.write("./cookie_thread_boot.#{SecureRandom.hex}", "thread booted")
+    end
 end