diff --git a/lib/AppInfo/Application.php b/lib/AppInfo/Application.php
index 582c72aa..9656e6af 100644
--- a/lib/AppInfo/Application.php
+++ b/lib/AppInfo/Application.php
@@ -27,12 +27,14 @@
 
 namespace OCA\Files_PDFViewer\AppInfo;
 
+use OCA\Files_PDFViewer\Listeners\CSPListener;
 use OCA\Files_PDFViewer\Listeners\LoadViewerListener;
 use OCA\Viewer\Event\LoadViewer;
 use OCP\AppFramework\App;
 use OCP\AppFramework\Bootstrap\IBootContext;
 use OCP\AppFramework\Bootstrap\IBootstrap;
 use OCP\AppFramework\Bootstrap\IRegistrationContext;
+use OCP\Security\CSP\AddContentSecurityPolicyEvent;
 use OCP\Util;
 
 class Application extends App implements IBootstrap {
@@ -44,6 +46,7 @@ public function __construct() {
 
 	public function register(IRegistrationContext $context): void {
 		$context->registerEventListener(LoadViewer::class, LoadViewerListener::class);
+		$context->registerEventListener(AddContentSecurityPolicyEvent::class, CSPListener::class);
 	}
 
 	public function boot(IBootContext $context): void {