diff --git a/Controller/CaptchaController.php b/Controller/CaptchaController.php
index 5cc45db..8d2fb1c 100644
--- a/Controller/CaptchaController.php
+++ b/Controller/CaptchaController.php
@@ -53,6 +53,7 @@ class CaptchaController extends Controller
 
         $response = new Response($generator->generate($options));
         $response->headers->set('Content-type', 'image/jpeg');
+        $response->headers->set('Pragma', 'no-cache');
 
         return $response;
     }