diff --git a/addons/base_iban/models/res_partner_bank.py b/addons/base_iban/models/res_partner_bank.py
index 7cbb44023c0..eabd77fcee1 100644
--- a/addons/base_iban/models/res_partner_bank.py
+++ b/addons/base_iban/models/res_partner_bank.py
@@ -35,7 +35,7 @@ def validate_iban(iban):
         raise ValidationError(_("The IBAN is invalid, it should begin with the country code"))
 
     iban_template = _map_iban_template[country_code]
-    if len(iban) != len(iban_template.replace(' ', '')):
+    if len(iban) != len(iban_template.replace(' ', '')) or not re.fullmatch("[a-zA-Z0-9]+", iban):
         raise ValidationError(_("The IBAN does not seem to be correct. You should have entered something like this %s\n"
             "Where B = National bank code, S = Branch code, C = Account No, k = Check digit") % iban_template)