diff --git a/lib/methods.js b/lib/methods.js
index 6cd0c4b..143a660 100644
--- a/lib/methods.js
+++ b/lib/methods.js
@@ -206,10 +206,17 @@ const methods = {
   },
   
   setWebhook(url, certificate) {
-    let args = !certificate ? [{ url }] :
-      [null, { url, certificate: fs.readFileSync(certificate) }];
-    args.unshift('/setWebhook');
-    return this.request.apply(this, args);
+    if (certificate) {
+      const form = {
+        url,
+        certificate: {
+          value: fs.readFileSync(certificate),
+          options: { filename: 'cert.pem' }
+        }
+      };
+      return this.request('/setWebhook', null, form);
+    }
+    return this.request('/setWebhook', { url });
   }
 
 };
diff --git a/lib/telebot.js b/lib/telebot.js
index 8d8e584..4fc2c00 100644
--- a/lib/telebot.js
+++ b/lib/telebot.js
@@ -83,9 +83,9 @@ class TeleBot {
 
     // Set webhook
     if (this.webhook) {
-      let { url, key } = this.webhook;
+      let { url, cert } = this.webhook;
       if (url) url = `${ url }/${ this.token }`;
-      return this.setWebhook(url, key).then(x => {
+      return this.setWebhook(url, cert).then(x => {
         console.log(`[bot.webhook] set to "${url}"`);
         return webhook.call(this, this, this.webhook);
       }).catch(error => {