diff --git a/app/Service/Informe/Contabilidad/Resumen.php b/app/Service/Informe/Contabilidad/Resumen.php
index bddba58..6d429c8 100644
--- a/app/Service/Informe/Contabilidad/Resumen.php
+++ b/app/Service/Informe/Contabilidad/Resumen.php
@@ -3,6 +3,7 @@ namespace App\Service\Informe\Contabilidad;
 
 use DateTimeInterface;
 use DateTimeImmutable;
+use DateInterval;
 use Incoviba\old\Proyecto\Proyecto;
 use Incoviba\old\Venta\Venta;
 use Incoviba\old\Venta\Pago;
@@ -33,7 +34,7 @@ class Resumen
     }
     protected function startOfYear(DateTimeInterface $up_to)
     {
-        return new DateTimeImmutable((clone $up_to)->sub('P1Y')->format('31-12-Y'));
+        return new DateTimeImmutable((clone $up_to)->sub(new DateInterval('P1Y'))->format('31-12-Y'));
     }
     protected function defaultValueDate(DateTimeInterface $up_to)
     {