diff --git a/server/config/config.go b/server/config/config.go
index 6be949e8a62..264c72bc1ea 100644
--- a/server/config/config.go
+++ b/server/config/config.go
@@ -548,9 +548,6 @@ func (c *PDServerConfig) adjust(meta *configutil.ConfigMetaData) error {
 	if !meta.IsDefined("dashboard-address") {
 		c.DashboardAddress = defaultDashboardAddress
 	}
-	if !meta.IsDefined("trace-region-flow") {
-		c.TraceRegionFlow = defaultTraceRegionFlow
-	}
 	if !meta.IsDefined("flow-round-by-digit") {
 		configutil.AdjustInt(&c.FlowRoundByDigit, defaultFlowRoundByDigit)
 	}