diff --git a/thread/test/test-pool.cpp b/thread/test/test-pool.cpp
index d56997cf..8a394b16 100644
--- a/thread/test/test-pool.cpp
+++ b/thread/test/test-pool.cpp
@@ -13,6 +13,7 @@
 #include <photon/thread/thread11.h>
 #include <photon/thread/workerpool.h>
 #include "../../test/ci-tools.h"
+#include <thread>
 
 DEFINE_int32(ths_total, 100, "total threads when testing threadpool.");