diff --git a/addons/account/account_bank_statement.py b/addons/account/account_bank_statement.py
index 4a9c1127410..a6f2c6d6eb0 100644
--- a/addons/account/account_bank_statement.py
+++ b/addons/account/account_bank_statement.py
@@ -795,7 +795,7 @@ class account_bank_statement_line(osv.osv):
                     #post an account line that use the same currency rate than the counterpart (to balance the account) and post the difference in another line
                     ctx['date'] = mv_line.date
                     if mv_line.currency_id.id == mv_line_dict['currency_id'] \
-                            and float_is_zero(mv_line.amount_currency - abs(mv_line_dict['amount_currency']), precision_rounding=mv_line.currency_id.rounding):
+                            and float_is_zero(abs(mv_line.amount_currency) - abs(mv_line_dict['amount_currency']), precision_rounding=mv_line.currency_id.rounding):
                         debit_at_old_rate = mv_line.credit
                         credit_at_old_rate = mv_line.debit
                     else: