diff --git a/include/tunnel_client.hpp b/include/tunnel_client.hpp
index 79bf93b..ac798ff 100644
--- a/include/tunnel_client.hpp
+++ b/include/tunnel_client.hpp
@@ -1,9 +1,5 @@
 #pragma once
 
-#ifndef ASIO_STANDALONE
-#define ASIO_STANDALONE
-#endif
-
 #include <atomic>
 #include <nlohmann/json.hpp>
 #include <string>
diff --git a/src/tunnel_client.cpp b/src/tunnel_client.cpp
index 32b3382..74a561e 100644
--- a/src/tunnel_client.cpp
+++ b/src/tunnel_client.cpp
@@ -1,7 +1,3 @@
-#ifndef ASIO_STANDALONE
-#define ASIO_STANDALONE
-#endif
-
 #include "tunnel_client.hpp"
 
 #include <atomic>