diff --git a/websocket-sharp/Server/HttpServer.cs b/websocket-sharp/Server/HttpServer.cs
index 242a962b..2f725dca 100644
--- a/websocket-sharp/Server/HttpServer.cs
+++ b/websocket-sharp/Server/HttpServer.cs
@@ -800,6 +800,43 @@ namespace WebSocketSharp.Server
         abort ();
     }
 
+    private void start ()
+    {
+      if (_state == ServerState.Start) {
+        _log.Info ("The server has already started.");
+        return;
+      }
+
+      if (_state == ServerState.ShuttingDown) {
+        _log.Warn ("The server is shutting down.");
+        return;
+      }
+
+      lock (_sync) {
+        if (_state == ServerState.Start) {
+          _log.Info ("The server has already started.");
+          return;
+        }
+
+        if (_state == ServerState.ShuttingDown) {
+          _log.Warn ("The server is shutting down.");
+          return;
+        }
+
+        _services.Start ();
+
+        try {
+          startReceiving ();
+        }
+        catch {
+          _services.Stop (1011, String.Empty);
+          throw;
+        }
+
+        _state = ServerState.Start;
+      }
+    }
+
     private void startReceiving ()
     {
       _listener.Start ();