diff --git a/controller/manifest.php b/controller/manifest.php
index a4e7d79..dc775d6 100644
--- a/controller/manifest.php
+++ b/controller/manifest.php
@@ -15,7 +15,6 @@
 use phpbb\language\language;
 use phpbb\path_helper;
 use phpbb\user;
-use phpbb\webpushnotifications\json\sanitizer as json_sanitizer;
 use Symfony\Component\HttpFoundation\JsonResponse;
 use Symfony\Component\HttpFoundation\Response;
 
@@ -66,7 +65,7 @@ public function handle(): JsonResponse
 
 		$manifest = [
 			'name'			=> $this->config['sitename'],
-			'short_name'	=> $this->config['pwa_short_name'] ?: utf8_substr($this->config['sitename'], 0, 12),
+			'short_name'	=> $this->config['pwa_short_name'] ?: utf8_substr(preg_replace('/[^\x20-\x7E]/', '', $this->config['sitename']), 0, 12),
 			'display'		=> 'standalone',
 			'orientation'	=> 'portrait',
 			'dir'			=> $this->language->lang('DIRECTION'),
@@ -90,6 +89,6 @@ public function handle(): JsonResponse
 			];
 		}
 
-		return new JsonResponse(json_sanitizer::sanitize($manifest));
+		return new JsonResponse($manifest);
 	}
 }