diff --git a/broker/src/main/java/org/apache/rocketmq/broker/topic/TopicConfigManager.java b/broker/src/main/java/org/apache/rocketmq/broker/topic/TopicConfigManager.java
index 1f2bb4d8ba49c00a4b10a0f674bd05aaf9aaa7a2..e09080afaea2774379e5781a6cc8acf242f0ce2a 100644
--- a/broker/src/main/java/org/apache/rocketmq/broker/topic/TopicConfigManager.java
+++ b/broker/src/main/java/org/apache/rocketmq/broker/topic/TopicConfigManager.java
@@ -320,7 +320,7 @@ public class TopicConfigManager extends ConfigManager {
                 topicConfig.setTopicSysFlag(TopicSysFlag.clearUnitFlag(oldTopicSysFlag));
             }
 
-            log.info("update topic sys flag. oldTopicSysFlag={}, newTopicSysFlag", oldTopicSysFlag,
+            log.info("update topic sys flag. oldTopicSysFlag={}, newTopicSysFlag={}", oldTopicSysFlag,
                 topicConfig.getTopicSysFlag());
 
             this.topicConfigTable.put(topic, topicConfig);
@@ -338,9 +338,11 @@ public class TopicConfigManager extends ConfigManager {
             int oldTopicSysFlag = topicConfig.getTopicSysFlag();
             if (hasUnitSub) {
                 topicConfig.setTopicSysFlag(TopicSysFlag.setUnitSubFlag(oldTopicSysFlag));
+            } else {
+                topicConfig.setTopicSysFlag(TopicSysFlag.clearUnitSubFlag(oldTopicSysFlag));
             }
 
-            log.info("update topic sys flag. oldTopicSysFlag={}, newTopicSysFlag", oldTopicSysFlag,
+            log.info("update topic sys flag. oldTopicSysFlag={}, newTopicSysFlag={}", oldTopicSysFlag,
                 topicConfig.getTopicSysFlag());
 
             this.topicConfigTable.put(topic, topicConfig);