diff --git a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/proto/hdfs.proto b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/proto/hdfs.proto
index 5ae58cfdda..08fce71560 100644
--- a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/proto/hdfs.proto
+++ b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/proto/hdfs.proto
@@ -198,7 +198,7 @@ message StorageTypeQuotaInfosProto {
 }
 
 message StorageTypeQuotaInfoProto {
-  required StorageTypeProto type = 1;
+  optional StorageTypeProto type = 1 [default = DISK];
   required uint64 quota = 2;
   required uint64 consumed = 3;
 }