diff --git a/attachment_synchronize/README.rst b/attachment_synchronize/README.rst
index 2e34e9854..cd377e983 100644
--- a/attachment_synchronize/README.rst
+++ b/attachment_synchronize/README.rst
@@ -52,6 +52,7 @@ Contributors
 * Valentin CHEMIERE <valentin.chemiere@akretion.com>
 * Mourad EL HADJ MIMOUNE <mourad.elhadj.mimoune@akretion.com>
 * Florian DA COSTA <florian.dacosta@akretion.com>
+* Giovanni SERRA <giovanni@gslab.it>
 
 Maintainer
 ----------
diff --git a/attachment_synchronize/__manifest__.py b/attachment_synchronize/__manifest__.py
index 9479bedfb..418efa80f 100644
--- a/attachment_synchronize/__manifest__.py
+++ b/attachment_synchronize/__manifest__.py
@@ -1,5 +1,6 @@
 # @ 2016 florian DA COSTA @ Akretion
 # © 2016 @author Mourad EL HADJ MIMOUNE <mourad.elhadj.mimoune@akretion.com>
+# @ 2020 Giovanni Serra @ GSlab.it
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 
 {
@@ -21,7 +22,7 @@
         'security/ir.model.access.csv',
     ],
     'demo': [
-#        'demo/task_demo.xml',
+        # 'demo/task_demo.xml',
     ],
     'installable': True,
     'application': False,
diff --git a/attachment_synchronize/models/task.py b/attachment_synchronize/models/task.py
index 54f4d8660..7a30e4b2e 100644
--- a/attachment_synchronize/models/task.py
+++ b/attachment_synchronize/models/task.py
@@ -172,5 +172,5 @@ class StorageTask(models.Model):
                         new_env.cr.commit()
 
     def _file_to_import(self, filenames):
-        imported = self.attachment_ids.search([('name', 'in', [n for n in filenames])]).mapped('name')
+        imported = self.attachment_ids.filtered(lambda r: r.name in filenames).mapped('name')
         return list(set(filenames) - set(imported))