diff --git a/src/InvoiceRule/Fuel.php b/src/InvoiceRule/Fuel.php
index 691a1ba2..e4f365b9 100644
--- a/src/InvoiceRule/Fuel.php
+++ b/src/InvoiceRule/Fuel.php
@@ -158,7 +158,7 @@ class Fuel implements InvoiceRuleInterface
         return null;
     }
 
-    protected function getPriceTierItemPrice($pt_id)
+    protected function getPriceTierItemPrice($pt_id, CustomerVehicle $cv)
     {
         // price_tier is default
         if ($pt_id == 0)