diff --git a/server/config/config.go b/server/config/config.go
index a6c565ef68a..8353af56c0c 100644
--- a/server/config/config.go
+++ b/server/config/config.go
@@ -577,7 +577,7 @@ func (c *PDServerConfig) adjust(meta *configutil.ConfigMetaData) error {
 
 func migrateConfigurationFromFile(meta *configutil.ConfigMetaData) error {
 	oldName, newName := "trace-region-flow", "flow-round-by-digit"
-	defineOld, _ := meta.IsDefined(oldName), meta.IsDefined(newName)
+	defineOld := meta.IsDefined(oldName)
 	switch {
 	case defineOld:
 		return errors.Errorf("config item %s and %s(deprecated) are conflict", newName, oldName)
diff --git a/server/config/config_test.go b/server/config/config_test.go
index cd9447a5824..b035ab22178 100644
--- a/server/config/config_test.go
+++ b/server/config/config_test.go
@@ -277,7 +277,7 @@ func TestMigrateFlags(t *testing.T) {
 	}
 	cfg, err := load(`
 [pd-server]
-trace-region-flow = false
+flow-round-by-digit = 127
 [schedule]
 disable-remove-down-replica = true
 enable-make-up-replica = false
diff --git a/tools/pd-ctl/tests/config/config_test.go b/tools/pd-ctl/tests/config/config_test.go
index 39820a6c7b7..22a2d7d7a12 100644
--- a/tools/pd-ctl/tests/config/config_test.go
+++ b/tools/pd-ctl/tests/config/config_test.go
@@ -150,7 +150,6 @@ func (suite *configTestSuite) checkConfig(cluster *pdTests.TestCluster) {
 	args = []string{"-u", pdAddr, "config", "set", "trace-region-flow", "false"}
 	_, err = tests.ExecuteCommand(cmd, args...)
 	re.NoError(err)
-	re.False(svr.GetPDServerConfig().TraceRegionFlow)
 
 	origin := svr.GetPDServerConfig().FlowRoundByDigit
 	args = []string{"-u", pdAddr, "config", "set", "flow-round-by-digit", "10"}