diff --git a/server_http.hpp b/server_http.hpp
index d82bda3..51b7f95 100644
--- a/server_http.hpp
+++ b/server_http.hpp
@@ -34,7 +34,7 @@ namespace SimpleWeb {
                     strand(strand), yield(yield), socket(socket), async_timer(new boost::asio::deadline_timer(io_service)), 
                     async_writing(new bool(false)), async_waiting(new bool(false)), stream(&streambuf) {}
 
-            void async_flush(std::function<void((const boost::system::error_code&))> callback=nullptr) {
+            void async_flush(std::function<void(const boost::system::error_code&)> callback=nullptr) {
                 if(!callback && !socket->lowest_layer().is_open()) {
                     if(*async_waiting)
                         async_timer->cancel();
@@ -131,14 +131,14 @@ namespace SimpleWeb {
         };
         
         std::unordered_map<std::string, std::unordered_map<std::string, 
-            std::function<void(ServerBase<socket_type>::Response&, std::shared_ptr<ServerBase<socket_type>::Request>)> > >  resource;
+            std::function<void(typename ServerBase<socket_type>::Response&, std::shared_ptr<typename ServerBase<socket_type>::Request>)> > >  resource;
         
         std::unordered_map<std::string, 
-            std::function<void(ServerBase<socket_type>::Response&, std::shared_ptr<ServerBase<socket_type>::Request>)> > default_resource;
+            std::function<void(typename ServerBase<socket_type>::Response&, std::shared_ptr<typename ServerBase<socket_type>::Request>)> > default_resource;
 
     private:
         std::vector<std::pair<std::string, std::vector<std::pair<std::regex, 
-            std::function<void(ServerBase<socket_type>::Response&, std::shared_ptr<ServerBase<socket_type>::Request>)> > > > > opt_resource;
+            std::function<void(typename ServerBase<socket_type>::Response&, std::shared_ptr<typename ServerBase<socket_type>::Request>)> > > > > opt_resource;
         
     public:
         void start() {
@@ -320,7 +320,7 @@ namespace SimpleWeb {
         }
         
         void write_response(std::shared_ptr<socket_type> socket, std::shared_ptr<Request> request, 
-                std::function<void(ServerBase<socket_type>::Response&, std::shared_ptr<ServerBase<socket_type>::Request>)>& resource_function) {
+                std::function<void(typename ServerBase<socket_type>::Response&, std::shared_ptr<typename ServerBase<socket_type>::Request>)>& resource_function) {
             std::shared_ptr<boost::asio::strand> strand(new boost::asio::strand(io_service));
 
             //Set timeout on the following boost::asio::async-read or write function