diff --git a/public/upsell.html b/public/upsell.html
index d21fb0f..98a9645 100644
--- a/public/upsell.html
+++ b/public/upsell.html
@@ -213,7 +213,8 @@ function calculateCost() {
         domains: parseInt(document.getElementById("domains").value),
         backupSlots: parseInt(document.getElementById("backupSlots").value),
         workers: parseInt(document.getElementById("workers").value),
-        hdd: parseInt(document.getElementById("hdd").value)
+        hdd: parseInt(document.getElementById("hdd").value),
+        cost: parseInt(document.getElementById("cost").value)
       };
 
       try {