diff --git a/invoice/src/main/java/org/killbill/billing/invoice/usage/details/UsageConsumableInArrearTierUnitAggregate.java b/invoice/src/main/java/org/killbill/billing/invoice/usage/details/UsageConsumableInArrearTierUnitAggregate.java
index 0a423d8..57ab28e 100644
--- a/invoice/src/main/java/org/killbill/billing/invoice/usage/details/UsageConsumableInArrearTierUnitAggregate.java
+++ b/invoice/src/main/java/org/killbill/billing/invoice/usage/details/UsageConsumableInArrearTierUnitAggregate.java
@@ -19,11 +19,12 @@ package org.killbill.billing.invoice.usage.details;
import java.math.BigDecimal;
-import org.killbill.billing.invoice.usage.details.UsageInArrearTierUnitDetail;
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
+@JsonIgnoreProperties(ignoreUnknown = true)
public class UsageConsumableInArrearTierUnitAggregate extends UsageInArrearTierUnitDetail {
private final int tierBlockSize;
diff --git a/invoice/src/main/java/org/killbill/billing/invoice/usage/details/UsageInArrearTierUnitDetail.java b/invoice/src/main/java/org/killbill/billing/invoice/usage/details/UsageInArrearTierUnitDetail.java
index 59aebc7..53d1918 100644
--- a/invoice/src/main/java/org/killbill/billing/invoice/usage/details/UsageInArrearTierUnitDetail.java
+++ b/invoice/src/main/java/org/killbill/billing/invoice/usage/details/UsageInArrearTierUnitDetail.java
@@ -20,8 +20,10 @@ package org.killbill.billing.invoice.usage.details;
import java.math.BigDecimal;
import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonProperty;
+@JsonIgnoreProperties(ignoreUnknown = true)
public class UsageInArrearTierUnitDetail {
protected final int tier;