diff --git a/runtime/include/worker_thread_epoll.h b/runtime/include/worker_thread_epoll.h
index f33a6b6..2fc4e73 100644
--- a/runtime/include/worker_thread_epoll.h
+++ b/runtime/include/worker_thread_epoll.h
@@ -1,3 +1,5 @@
+#pragma once
+
 #include "worker_thread.h"
 
 static inline void