diff --git a/backend/service-authentication/config.js b/backend/service-authentication/config.js
index ad36165..4e951d0 100644
--- a/backend/service-authentication/config.js
+++ b/backend/service-authentication/config.js
@@ -1,7 +1,7 @@
 const config = {
     // paramètres de connexion à la base de données
     mongodbDatabase: 'chat',
-    mongodbHost:     'mongodb://localhost:27017/',
+    mongodbHost:     'mongodb://mongodb-authentication:27017/',
     charset:       'utf8',
     mongodbLogin:  '',
     mongodbPassword: '',