diff --git a/services/web/app/src/infrastructure/GracefulShutdown.js b/services/web/app/src/infrastructure/GracefulShutdown.js
index b4b345fb95..515f8b1e7e 100644
--- a/services/web/app/src/infrastructure/GracefulShutdown.js
+++ b/services/web/app/src/infrastructure/GracefulShutdown.js
@@ -52,8 +52,8 @@ async function runHandlers(stage, handlers, logOnly) {
 }
 
 /**
- * @param {import('net').Server} server
- * @param {string} signal
+ * @param {import('net').Server} [server]
+ * @param {number|string} [signal]
  */
 async function gracefulShutdown(server, signal) {
   logger.warn({ signal }, 'graceful shutdown: started shutdown sequence')