diff --git a/app/models/auth/Group.model.js b/app/models/auth/Group.model.js
index 27c29ed..5bbe109 100644
--- a/app/models/auth/Group.model.js
+++ b/app/models/auth/Group.model.js
@@ -54,7 +54,7 @@ class GroupModel extends Model {
             cn: this.name,
             dn: this.dn.format(this.configs.get('ldap:server.format')),
             objectClass: ['groupOfNames', 'posixGroup'],
-            gidNumber: await this.get_gid_number(),
+            gidNumber: String(await this.get_gid_number()),
             member: users.map(x => x.dn.format(this.configs.get('ldap:server.format'))),
         }
     }
diff --git a/app/models/auth/User.model.js b/app/models/auth/User.model.js
index 57dfab3..882b996 100644
--- a/app/models/auth/User.model.js
+++ b/app/models/auth/User.model.js
@@ -213,7 +213,7 @@ class User extends AuthUser {
             objectGuid: this.uuid,
             objectguid: this.uuid,
             uidNumber: uid_number,
-            gidNumber: await this.get_uid_number(), // group_ids.map(x => String(x)),
+            gidNumber: String(await this.get_uid_number()), // group_ids.map(x => String(x)),
             loginShell: shell,
             homeDirectory: `/home/${this.uid}@${domain}`
         }