diff --git a/src/storage/ddl/ob_ddl_merge_task.cpp b/src/storage/ddl/ob_ddl_merge_task.cpp
index 213286a9e8..4a087e801d 100644
--- a/src/storage/ddl/ob_ddl_merge_task.cpp
+++ b/src/storage/ddl/ob_ddl_merge_task.cpp
@@ -432,7 +432,7 @@ int ObTabletDDLUtil::check_data_integrity(ObTableStoreIterator &ddl_sstable_iter
 {
   int ret = OB_SUCCESS;
   is_data_complete = false;
-  if (OB_UNLIKELY(!ddl_sstable_iter.is_valid() || !start_scn.is_valid_and_not_min() || !prepare_scn.is_valid_and_not_min() || prepare_scn <= start_scn)) {
+  if (OB_UNLIKELY(!ddl_sstable_iter.is_valid() || !start_scn.is_valid_and_not_min() || !prepare_scn.is_valid_and_not_min() || prepare_scn < start_scn)) {
     ret = OB_INVALID_ARGUMENT;
     LOG_WARN("invalid argument", K(ret), K(ddl_sstable_iter.count()), K(start_scn), K(prepare_scn));
   } else if (0 == ddl_sstable_iter.count()) {