diff --git a/src/oatpp-test/web/ClientServerTestRunner.hpp b/src/oatpp-test/web/ClientServerTestRunner.hpp
index f424524c..f0d68d3e 100644
--- a/src/oatpp-test/web/ClientServerTestRunner.hpp
+++ b/src/oatpp-test/web/ClientServerTestRunner.hpp
@@ -37,6 +37,7 @@
 #include <chrono>
 #include <mutex>
 #include <condition_variable>
+#include <thread>
 
 namespace oatpp { namespace test { namespace web {