diff --git a/addons/account_voucher/account_voucher.py b/addons/account_voucher/account_voucher.py
index 6c54437dc35..4b4639daeb6 100644
--- a/addons/account_voucher/account_voucher.py
+++ b/addons/account_voucher/account_voucher.py
@@ -1226,7 +1226,7 @@ class account_voucher(osv.osv):
                         # if the rate is specified on the voucher, it will be used thanks to the special keys in the context
                         # otherwise we use the rates of the system
                         amount_currency = currency_obj.compute(cr, uid, company_currency, line.move_line_id.currency_id.id, move_line['debit']-move_line['credit'], context=ctx)
-                if line.amount == line.amount_unreconciled and line.move_line_id.currency_id.id == voucher_currency:
+                if line.amount == line.amount_unreconciled:
                     sign = voucher.type in ('payment', 'purchase') and -1 or 1
                     foreign_currency_diff = sign * line.move_line_id.amount_residual_currency + amount_currency