diff --git a/app/Controllers/Auth.php b/app/Controllers/Auth.php
index fc67dc2..ff41e0d 100644
--- a/app/Controllers/Auth.php
+++ b/app/Controllers/Auth.php
@@ -83,7 +83,7 @@ class Auth extends Controller {
         $password = password_hash($password, PASSWORD_DEFAULT);
 
         $master = $this->request->getJsonVar('master');
-        $masterkey = getenv('masterkey');
+        $masterkey = getenv('MASTERKEY');
         
         if($master != $masterkey) {
             return $this->fail('Invalid master key.', 401);