diff --git a/broker/src/main/java/org/apache/rocketmq/broker/processor/AdminBrokerProcessor.java b/broker/src/main/java/org/apache/rocketmq/broker/processor/AdminBrokerProcessor.java
index 97ca51d966d38b18bfdfb430c707a093b2e41a42..c481d14d22662e32165912dd6e2e0145d236d0d6 100644
--- a/broker/src/main/java/org/apache/rocketmq/broker/processor/AdminBrokerProcessor.java
+++ b/broker/src/main/java/org/apache/rocketmq/broker/processor/AdminBrokerProcessor.java
@@ -1445,7 +1445,7 @@ public class AdminBrokerProcessor extends AsyncNettyRequestProcessor implements
 
         java.io.File commitLogDir = new java.io.File(this.brokerController.getMessageStoreConfig().getStorePathRootDir());
         if (commitLogDir.exists()) {
-            runtimeInfo.put("commitLogDirCapacity", String.format("Total : %s, Free : %s.", MixAll.humanReadableByteCount(commitLogDir.getTotalSpace(), false), MixAll.humanReadableByteCount(commitLogDir.getFreeSpace(), false)));
+            runtimeInfo.put("commitLogDirCapacity", String.format("Total : %s, Free : %s.", MixAll.humanReadableByteCount(commitLogDir.getTotalSpace(), false), MixAll.humanReadableByteCount(commitLogDir.getUsableSpace(), false)));
         }
 
         return runtimeInfo;