diff --git a/addons/account/models/account_bank_statement.py b/addons/account/models/account_bank_statement.py
index 9bbfbbc7c70..43745287c33 100644
--- a/addons/account/models/account_bank_statement.py
+++ b/addons/account/models/account_bank_statement.py
@@ -338,7 +338,7 @@ class AccountBankStatement(models.Model):
     def link_bank_to_partner(self):
         for statement in self:
             for st_line in statement.line_ids:
-                if st_line.bank_account_id and st_line.partner_id and st_line.bank_account_id.partner_id != st_line.partner_id:
+                if st_line.bank_account_id and st_line.partner_id and not st_line.bank_account_id.partner_id:
                     st_line.bank_account_id.partner_id = st_line.partner_id