diff --git a/addons/account/models/account_bank_statement.py b/addons/account/models/account_bank_statement.py
index 1b809fe59a9..04ca1228824 100644
--- a/addons/account/models/account_bank_statement.py
+++ b/addons/account/models/account_bank_statement.py
@@ -711,8 +711,11 @@ class AccountBankStatementLine(models.Model):
             elif st_line_currency == company_currency:
                 total_amount = self.amount_currency
             else:
-                total_amount = statement_currency.with_context({'date': self.date}).compute(self.amount, company_currency)
-            ratio = total_amount / amount
+                total_amount = statement_currency.with_context({'date': self.date}).compute(self.amount, company_currency, round=False)
+            if float_is_zero(total_amount - amount, precision_rounding=company_currency.rounding):
+                ratio = total_amount / amount
+            else:
+                ratio = 1.0
             # Then use it to adjust the statement.line field that correspond to the move.line amount_currency
             if statement_currency != company_currency:
                 amount_currency = self.amount * ratio