diff --git a/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/persistent/PersistentTopic.java b/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/persistent/PersistentTopic.java
index ab719252f8c1e..34cad879e6631 100644
--- a/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/persistent/PersistentTopic.java
+++ b/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/persistent/PersistentTopic.java
@@ -1442,7 +1442,8 @@ public void updateRates(NamespaceStats nsStats, NamespaceBundleStats bundleStats
         topicStatsStream.writePair("msgRateOut", topicStatsHelper.aggMsgRateOut);
         topicStatsStream.writePair("msgThroughputIn", topicStatsHelper.aggMsgThroughputIn);
         topicStatsStream.writePair("msgThroughputOut", topicStatsHelper.aggMsgThroughputOut);
-        topicStatsStream.writePair("storageSize", ledger.getEstimatedBacklogSize());
+        topicStatsStream.writePair("storageSize", ledger.getTotalSize());
+        topicStatsStream.writePair("backlogSize", ledger.getEstimatedBacklogSize());
         topicStatsStream.writePair("pendingAddEntriesCount", ((ManagedLedgerImpl) ledger).getPendingAddEntriesCount());
 
         nsStats.msgRateIn += topicStatsHelper.aggMsgRateIn;