diff --git a/client_http.hpp b/client_http.hpp
index 96a17f4..1dd551b 100644
--- a/client_http.hpp
+++ b/client_http.hpp
@@ -9,6 +9,7 @@
 #ifdef USE_STANDALONE_ASIO
 #include <asio.hpp>
 namespace SimpleWeb {
+  namespace asio = asio;
   using error_code = std::error_code;
   using errc = std::errc;
   using system_error = std::system_error;
diff --git a/server_http.hpp b/server_http.hpp
index 7862835..23ffd1e 100644
--- a/server_http.hpp
+++ b/server_http.hpp
@@ -11,6 +11,7 @@
 #ifdef USE_STANDALONE_ASIO
 #include <asio.hpp>
 namespace SimpleWeb {
+  namespace asio = asio;
   using error_code = std::error_code;
   using errc = std::errc;
   namespace make_error_code = std;