diff --git a/websocket-sharp/Server/HttpServer.cs b/websocket-sharp/Server/HttpServer.cs
index 8692f77d..5b9c150d 100644
--- a/websocket-sharp/Server/HttpServer.cs
+++ b/websocket-sharp/Server/HttpServer.cs
@@ -788,25 +788,6 @@ namespace WebSocketSharp.Server
       return _state == ServerState.Ready || _state == ServerState.Stop;
     }
 
-    private bool canSet (out string message)
-    {
-      message = null;
-
-      if (_state == ServerState.Start) {
-        message = "The server has already started.";
-
-        return false;
-      }
-
-      if (_state == ServerState.ShuttingDown) {
-        message = "The server is shutting down.";
-
-        return false;
-      }
-
-      return true;
-    }
-
     private bool checkCertificate (out string message)
     {
       message = null;