diff --git a/core/modules/image/src/Controller/ImageStyleDownloadController.php b/core/modules/image/src/Controller/ImageStyleDownloadController.php
index 838c18c..4ad6dc6 100644
--- a/core/modules/image/src/Controller/ImageStyleDownloadController.php
+++ b/core/modules/image/src/Controller/ImageStyleDownloadController.php
@@ -122,7 +122,7 @@ public function deliver(Request $request, $scheme, ImageStyleInterface $image_st
 
         if ($response instanceof BinaryFileResponse) {
           $response->headers->add([
-            'Cache-Control' => 'private, must-revalidate',
+            'Cache-Control' => 'private',
             'Expires' => \DateTime::createFromFormat('j-M-Y H:i:s T', '19-Nov-1978 05:00:00 GMT')->format('D, d M Y H:i:s T'),
           ]);
         }
@@ -180,6 +180,8 @@ public function deliver(Request $request, $scheme, ImageStyleInterface $image_st
       $headers += array(
         'Content-Type' => $image->getMimeType(),
         'Content-Length' => $image->getFileSize(),
+        'Cache-Control' => 'private',
+        'Expires' => \DateTime::createFromFormat('j-M-Y H:i:s T', '19-Nov-1978 05:00:00 GMT')->format('D, d M Y H:i:s T'),
       );
       return new BinaryFileResponse($uri, 200, $headers);
     }