include needed headers
diff --git a/req/include/req_common.hpp b/req/include/req_common.hpp
index 1db9def..d2dc518 100755
--- a/req/include/req_common.hpp
+++ b/req/include/req_common.hpp
@@ -20,6 +20,9 @@
 #ifndef REQ_COMMON_HPP_
 #define REQ_COMMON_HPP_
 
+#include <random>
+#include <chrono>
+
 #include "serde.hpp"
 #include "common_defs.hpp"