diff --git a/br/pkg/task/restore.go b/br/pkg/task/restore.go
index 64fa8bacc26c8..b4ecfc69c7c6a 100644
--- a/br/pkg/task/restore.go
+++ b/br/pkg/task/restore.go
@@ -47,7 +47,7 @@ const (
 	defaultPDConcurrency      = 1
 	defaultBatchFlushInterval = 16 * time.Second
 	defaultDDLConcurrency     = 16
-	defaultFlagDdlBatchSize   = 128
+	defaultFlagDdlBatchSize   = 1
 )
 
 // RestoreCommonConfig is the common configuration for all BR restore tasks.