diff --git a/httpdocs/assets/js/safekat/components/preview.js b/httpdocs/assets/js/safekat/components/preview.js
index 269e8888..8f3744dc 100644
--- a/httpdocs/assets/js/safekat/components/preview.js
+++ b/httpdocs/assets/js/safekat/components/preview.js
@@ -115,7 +115,7 @@ class previewFormas {
         //console.log(pvObj);
 
         // Printing shape definition
-        this.pvObj.anchoForma = (_isCosido) ? 2 * this.pvObj.anchoLibro : this.pvObj.anchoLibro;
+        this.pvObj.anchoForma = parseInt(_isCosido) ? 2 * this.pvObj.anchoLibro : this.pvObj.anchoLibro;
         this.pvObj.altoForma = this.pvObj.altoLibro;