diff --git a/server_http.hpp b/server_http.hpp
index b4e5e68..a52e16e 100644
--- a/server_http.hpp
+++ b/server_http.hpp
@@ -405,7 +405,7 @@ namespace SimpleWeb {
       {
 #if defined(__linux__) && defined(TCP_FASTOPEN)
         const int qlen = 5; // This seems to be the value that is used in other examples.
-        boost::system::error_code ec;
+        error_code ec{};
         acceptor->set_option(asio::detail::socket_option::integer<IPPROTO_TCP, TCP_FASTOPEN>(qlen), ec);
 #endif // End Linux
       }