diff --git a/tests/unit/server.test.ts b/tests/unit/server.test.ts
index 2b9380d..5924999 100644
--- a/tests/unit/server.test.ts
+++ b/tests/unit/server.test.ts
@@ -581,7 +581,7 @@ describe('WebhookServer', () => {
         data: {
           key: {
             remoteJid: 'group-id@g.us',
-            participant: 'invalid-user@s.whatsapp.net'
+            participant: 'invalid!user@s.whatsapp.net'
           },
           message: { conversation: '/tarea nueva Test' }
         }