diff --git a/sdk/recoveryservicesbackup/arm-recoveryservicesbackup/src/models/mappers.ts b/sdk/recoveryservicesbackup/arm-recoveryservicesbackup/src/models/mappers.ts
index 0fbe63fcebaa..a0a7fa6cc954 100644
--- a/sdk/recoveryservicesbackup/arm-recoveryservicesbackup/src/models/mappers.ts
+++ b/sdk/recoveryservicesbackup/arm-recoveryservicesbackup/src/models/mappers.ts
@@ -153,7 +153,7 @@ export const ProtectedItem: msRest.CompositeMapper = {
         }
       },
       isDeferredDeleteScheduleUpcoming: {
-        serializedName: "IsDeferredDeleteScheduleUpcoming",
+        serializedName: "isDeferredDeleteScheduleUpcoming",
         type: {
           name: "Boolean"
         }