diff --git a/dm/checker/checker.go b/dm/checker/checker.go
index 530e1c5fdf3..9f4ef5ecdf5 100644
--- a/dm/checker/checker.go
+++ b/dm/checker/checker.go
@@ -502,7 +502,6 @@ func (c *Checker) Init(ctx context.Context) (err error) {
 			newLightningPrecheckAdaptor(targetInfoGetter, info),
 			cpdb,
 			pdClient,
-			targetDB,
 		)
 
 		if _, ok := c.checkingItems[config.LightningFreeSpaceChecking]; ok {