diff --git a/usage/src/com/cloud/usage/UsageManagerImpl.java b/usage/src/com/cloud/usage/UsageManagerImpl.java
index 8429c6073de..5453be99317 100644
--- a/usage/src/com/cloud/usage/UsageManagerImpl.java
+++ b/usage/src/com/cloud/usage/UsageManagerImpl.java
@@ -1726,7 +1726,8 @@ public class UsageManagerImpl extends ManagerBase implements UsageManager, Runna
         Long offeringId = event.getOfferingId();
         Long zoneId = event.getZoneId();
         Long accountId = event.getAccountId();
-        long size = event.getSize();
+        //Size could be null for VM snapshot delete events
+        long size = (event.getSize() == null) ? 0 : event.getSize();
         Date created = event.getCreateDate();
         Account acct = _accountDao.findByIdIncludingRemoved(event.getAccountId());
         Long domainId = acct.getDomainId();