diff --git a/invoice/src/main/java/org/killbill/billing/invoice/api/user/DefaultInvoiceUserApi.java b/invoice/src/main/java/org/killbill/billing/invoice/api/user/DefaultInvoiceUserApi.java
index 3485682..a12d7be 100644
--- a/invoice/src/main/java/org/killbill/billing/invoice/api/user/DefaultInvoiceUserApi.java
+++ b/invoice/src/main/java/org/killbill/billing/invoice/api/user/DefaultInvoiceUserApi.java
@@ -342,6 +342,7 @@ public class DefaultInvoiceUserApi implements InvoiceUserApi {
charge.getRate(),
charge.getCurrency(),
charge.getLinkedItemId(),
+ charge.getQuantity(),
charge.getItemDetails());
invoiceForExternalCharge.addInvoiceItem(externalCharge);