diff --git a/django/sp_sso/saml/utils.py b/django/sp_sso/saml/utils.py
index 4fa6d6c..cc44b49 100644
--- a/django/sp_sso/saml/utils.py
+++ b/django/sp_sso/saml/utils.py
@@ -32,6 +32,12 @@ supann_host_role_attribute = 'supannRoleGenerique'
 supann_host_role_value = '{SUPANN}R10' # 'Responsable de mission'
 
 
+def sorting_key(tuple_input):
+    if type(tuple_input[1]) is unicode:
+        return tuple_input[1].encode('utf-8')
+    else:
+        return unicode(tuple_input[1], 'utf-8')
+
 def render_message(request, message):
     """Renders a simple message to a base template"""
     return render(request, 'simple_message.html', {'message': message})
@@ -114,7 +120,7 @@ def ldap_get_attribute_from_subtree_nodes(subtree_base, filter, attribute):
         description =  node_data.get('description', [_('No description')])[0]
         choices.append((attribute_value, description))
 
-    choices.sort(key=lambda x: unicode(x[1], 'utf-8'))
+    choices.sort(key=sorting_key)
     return choices
 
 def ldap_terminate(l):