diff --git a/src/Service/InvoiceManager.php b/src/Service/InvoiceManager.php
index 8743a099..1a17fe7d 100644
--- a/src/Service/InvoiceManager.php
+++ b/src/Service/InvoiceManager.php
@@ -44,7 +44,7 @@ class InvoiceManager
             new Invoice\TireRepair(),
             new Invoice\DiscountType(),
             new Invoice\TradeIn(),
-            new Invoice\Tax,
+            new Invoice\Tax(),
         ]; 
     }