diff --git a/app/Controllers/extensionController.php b/app/Controllers/extensionController.php
index 599babf7c..547fe80bc 100644
--- a/app/Controllers/extensionController.php
+++ b/app/Controllers/extensionController.php
@@ -362,7 +362,8 @@ class FreshRSS_extension_Controller extends FreshRSS_ActionController {
 		header("Content-Disposition: inline; filename='{$filename}'");
 		header('Referrer-Policy: same-origin');
 		if (file_exists(DATA_PATH . '/no-cache.txt') || !httpConditional($mtime, cacheSeconds: 604800, cachePrivacy: 2)) {
-			echo $extension->getFile($filename);
+			$contents = $extension->getFile($filename);
+			$this->view->content = is_string($contents) ? $contents : '';
 		}
 	}
 }
diff --git a/app/views/extension/serve.phtml b/app/views/extension/serve.phtml
index e69de29bb..af0b21ea1 100644
--- a/app/views/extension/serve.phtml
+++ b/app/views/extension/serve.phtml
@@ -0,0 +1,4 @@
+<?php
+declare(strict_types=1);
+/** @var FreshRSS_View $this */
+echo $this->content;