diff --git a/index.js b/index.js
index b6dc3b4..290ce5b 100644
--- a/index.js
+++ b/index.js
@@ -23,7 +23,7 @@ if (!Number(config.polling)) {
 var bot = new telegram(config.token, options);
 
 if (!Number(config.polling)) {
-    bot.setWebHook(config.webhook_prefix + config.token, __dirname+'/crt.pem');
+    bot.setWebHook(config.webhook_prefix + config.token, {certificate: __dirname+'/crt.pem'});
 }
 
 function sendMessage(destination, message, retry) {