diff --git a/util/log/log.go b/util/log/log.go
index e1e412d53..28aec0a2b 100644
--- a/util/log/log.go
+++ b/util/log/log.go
@@ -678,7 +678,7 @@ func QosWriteDebugf(format string, v ...interface{}) {
 	if gLog == nil {
 		return
 	}
-	if UpdateLevel&gLog.level != gLog.level {
+	if DebugLevel&gLog.level != gLog.level {
 		return
 	}
 	s := fmt.Sprintf(format, v...)