diff --git a/api/serializers.py b/api/serializers.py
index 4d406898..2e938a35 100644
--- a/api/serializers.py
+++ b/api/serializers.py
@@ -547,7 +547,7 @@ class AdherentSerializer(NamespacedHMSerializer):
         fields = ('name', 'surname', 'pseudo', 'email', 'local_email_redirect',
                   'local_email_enabled', 'school', 'shell', 'comment',
                   'state', 'registered', 'telephone', 'room', 'solde',
-                  'access', 'end_access', 'uid', 'api_url')
+                  'access', 'end_access', 'uid', 'api_url','gid')
         extra_kwargs = {
             'shell': {'view_name': 'shell-detail'}
         }
diff --git a/users/models.py b/users/models.py
index bceb84bb..f3e786c0 100755
--- a/users/models.py
+++ b/users/models.py
@@ -349,6 +349,11 @@ class User(RevMixin, FieldPermissionModelMixin, AbstractBaseUser,
         """ Renvoie seulement le nom"""
         return self.surname
 
+    @cached_property
+    def gid(self):
+        """return the default gid of user"""
+        return LDAP['user_gid']
+
     @property
     def get_shell(self):
         """ A utiliser de préférence, prend le shell par défaut