diff --git a/addons/l10n_it_edi/models/ir_mail_server.py b/addons/l10n_it_edi/models/ir_mail_server.py
index 5e9e1fb1f10..4362a29e913 100644
--- a/addons/l10n_it_edi/models/ir_mail_server.py
+++ b/addons/l10n_it_edi/models/ir_mail_server.py
@@ -84,9 +84,9 @@ class FetchmailServer(models.Model):
 
                     # To leave the mail in the state in which they were.
                     if "Seen" not in data[1].decode("utf-8"):
-                        imap_server.store(uid, '+FLAGS', '\\Seen')
+                        imap_server.uid('STORE', uid, '+FLAGS', '(\\Seen)')
                     else:
-                        imap_server.store(uid, '-FLAGS', '\\Seen')
+                        imap_server.uid('STORE', uid, '-FLAGS', '(\\Seen)')
 
                     # See details in message_process() in mail_thread.py
                     if isinstance(message, xmlrpclib.Binary):