diff --git a/modules/account/move.py b/modules/account/move.py
index 0289a971d7..aeae4fe5e2 100644
--- a/modules/account/move.py
+++ b/modules/account/move.py
@@ -2175,7 +2175,7 @@ class Reconcile(Wizard):
                 )
         where = ((line.reconciliation == Null)
             & (line.account == account.id)
-            & (line.party == party.id if party else None))
+            & (line.party == (party.id if party else None)))
         currency_expr = Coalesce(line.second_currency, account.currency.id)
         if currency:
             where &= (currency_expr == currency.id)