diff --git a/src/yunohost/permission.py b/src/yunohost/permission.py
index 972a863c5..33efab1a9 100644
--- a/src/yunohost/permission.py
+++ b/src/yunohost/permission.py
@@ -290,8 +290,8 @@ def permission_create(operation_logger, permission, allowed=None,
         'cn': str(permission),
         'gidNumber': gid,
         'authHeader': ['TRUE'],
-        'label': [permission.split('.')[0].title() if permission.endswith('.main')
-                  else "%s (%s)" % (permission.split('.')[0].title(), permission.split('.')[1])],
+        'label': [str(permission.split('.')[0].title() if permission.endswith('.main')
+                  else "%s (%s)" % (permission.split('.')[0].title(), permission.split('.')[1]))],
         'showTile': ['FALSE'], # Dummy value, it will be fixed when we call '_update_ldap_group_permission'
         'isProtected': ['FALSE'] # Dummy value, it will be fixed when we call '_update_ldap_group_permission'
     }