diff --git a/src/authentic2_cut/apps.py b/src/authentic2_cut/apps.py
index af99481..846497b 100644
--- a/src/authentic2_cut/apps.py
+++ b/src/authentic2_cut/apps.py
@@ -16,6 +16,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+import copy
 import logging
 
 import django.apps
@@ -30,6 +31,7 @@ from authentic2.constants import AUTHENTICATION_EVENTS_SESSION_KEY
 
 logger = logging.getLogger(__name__)
 
+
 class AppConfig(django.apps.AppConfig):
     name = 'authentic2_cut'
 
@@ -224,25 +226,29 @@ class AppConfig(django.apps.AppConfig):
         if view.__class__.__name__ == 'UsersView':
             ou = view.search_form.cleaned_data['ou']
             sequence = list(table.sequence)
+            base_columns = copy.deepcopy(type(table).base_columns)
+
             if ou and ou.slug == 'usagers':
                 for column_name in ['username', 'link']:
-                    if column_name in table.base_columns:
-                        del table.base_columns[column_name]
+                    if column_name in base_columns:
+                        del base_columns[column_name]
                     if column_name in sequence:
                         sequence.remove(column_name)
                 sequence.remove('email')
                 sequence.insert(2, 'email')
-                table.base_columns['preferred_username'] = tables.Column(
+                base_columns['preferred_username'] = tables.Column(
                     accessor='attributes.preferred_username', verbose_name=u'Nom d\'usage')
                 sequence.insert(2, 'preferred_username')
-                table.base_columns['validated'] = tables.BooleanColumn(
+                base_columns['validated'] = tables.BooleanColumn(
                     accessor='attributes.validated', verbose_name=u'Validé')
                 sequence += ['validated']
             else:
-                del table.base_columns['link']
+                del base_columns['link']
                 sequence.remove('link')
-            table.columns = tables.columns.BoundColumns(table)
+
+            table.base_columns = base_columns
             table.sequence = sequence
+            table.columns = tables.columns.BoundColumns(table, base_columns)
         return table
 
     def a2_hook_api_modify_serializer(self, view, serializer):