diff --git a/include/fc/network/http/websocket.hpp b/include/fc/network/http/websocket.hpp
index 4894055..f9b8c6a 100644
--- a/include/fc/network/http/websocket.hpp
+++ b/include/fc/network/http/websocket.hpp
@@ -53,7 +53,7 @@ namespace fc { namespace http {
    class websocket_server
    {
       public:
-         websocket_server(const std::string& forward_header_key);
+         websocket_server(const std::string& forward_header_key = std::string());
          ~websocket_server();
 
          void on_connection( const on_connection_handler& handler);
@@ -78,7 +78,7 @@ namespace fc { namespace http {
       public:
          websocket_tls_server( const std::string& server_pem,
                                const std::string& ssl_password,
-                               const std::string& forward_header_key );
+                               const std::string& forward_header_key = std::string() );
          ~websocket_tls_server();
 
          void on_connection( const on_connection_handler& handler);