diff --git a/src/Classes/App.php b/src/Classes/App.php
index 748f484e..74db9f49 100644
--- a/src/Classes/App.php
+++ b/src/Classes/App.php
@@ -107,6 +107,7 @@ public static function start(): void
             die();
         }
 
+        header('Content-Type: text/html; charset=utf-8');
         echo $result['content'] ?? '';
     }