diff --git a/packages/backend/src/server/web/ClientServerService.ts b/packages/backend/src/server/web/ClientServerService.ts
index 7f1a43792..a83137f74 100644
--- a/packages/backend/src/server/web/ClientServerService.ts
+++ b/packages/backend/src/server/web/ClientServerService.ts
@@ -178,8 +178,8 @@ export class ClientServerService {
 			const csp = this.config.contentSecurityPolicy
 				?? 'script-src \'self\' \'unsafe-eval\' ' +
 				'https://challenges.cloudflare.com https://hcaptcha.com https://*.hcaptcha.com https://www.google.com/recaptcha/ https://www.gstatic.com/recaptcha/ https://www.recaptcha.net/recaptcha/; ' +
-				'base-uri \'self\'; object-src \'self\';';
-			reply.header('Content-Security-Policy', csp);
+				'base-uri \'self\'; object-src \'self\'; report-uri /csp-error';
+			reply.header('Content-Security-Policy-Report-Only', csp);
 			done();
 		});