diff --git a/bootstrap/modules/callback/github.php b/bootstrap/modules/callback/github.php
index 9ea1514..02f9844 100644
--- a/bootstrap/modules/callback/github.php
+++ b/bootstrap/modules/callback/github.php
@@ -6,7 +6,8 @@ class callback_github extends Module
 
 	public function __default()
 	{
-		if (isset($_SERVER['REMOTE_ADDR'], $_POST['payload'])
+		if (isset($_SERVER['HTTP_USER_AGENT'], $_SERVER['REMOTE_ADDR'], $_POST['payload'])
+			&& $_SERVER['HTTP_USER_AGENT'] == 'GitHub Services Web Hook'
 			&& in_array($_SERVER['REMOTE_ADDR'], array('207.97.227.253', '50.57.128.197', '108.171.174.178')))
 		{
 			`git pull origin master`;