diff --git a/httpdocs/assets/js/safekat/components/preview.js b/httpdocs/assets/js/safekat/components/preview.js
index 25e049e3..02f02d81 100644
--- a/httpdocs/assets/js/safekat/components/preview.js
+++ b/httpdocs/assets/js/safekat/components/preview.js
@@ -146,7 +146,7 @@ class previewFormas {
                     let anchoPliegue = parseFloat(7);  // mm
                     let altoPliegue = parseFloat(7);  // mm
                     let sangre = parseFloat(20);  // mm
-                    if (this.isTapaDura && (this.ancho >= 210 || this.alto >= 297)) {
+                    if (this.isTapaDura && (this.ancho() >= 210 || this.alto() >= 297)) {
                         sangre = parseFloat(10);  // mm
                     }
                     this.pvObj.anchoForma = ((2 * this.pvObj.anchoLibro) + (2 * anchoPliegue) + (2 * sangre) + this.pvObj.lomoLibro);