diff --git a/include/rpc_client.hpp b/include/rpc_client.hpp
index f9ed647..beea7c8 100644
--- a/include/rpc_client.hpp
+++ b/include/rpc_client.hpp
@@ -1,4 +1,5 @@
 #pragma once
+#include <iostream>
 #include <string>
 #include <deque>
 #include <future>