diff --git a/Elwig/Helpers/Billing/BillingData.cs b/Elwig/Helpers/Billing/BillingData.cs
index 7992800..afd0ba3 100644
--- a/Elwig/Helpers/Billing/BillingData.cs
+++ b/Elwig/Helpers/Billing/BillingData.cs
@@ -214,7 +214,7 @@ namespace Elwig.Helpers.Billing {
 
             try {
                 return new JsonObject() {
-                    ["15kmw"] = Math.Round(x.Distinct().Single(), prec)
+                    ["15kmw"] = Math.Round(y.Distinct().Single(), prec)
                 };
             } catch { }