diff --git a/src/share/ob_zone_merge_info.h b/src/share/ob_zone_merge_info.h
index 2416f436015be3578d6db9a9c0bb1787dadf3c5f..e32cbe612625bb223d44948e75d74ad76159588e 100644
--- a/src/share/ob_zone_merge_info.h
+++ b/src/share/ob_zone_merge_info.h
@@ -177,7 +177,7 @@ public:
 
   ObMergeProgress() 
     : tenant_id_(0), zone_(), unmerged_tablet_cnt_(0), unmerged_data_size_(0),
-      merged_tablet_cnt_(0), merged_data_size_(0), smallest_snapshot_scn_()
+      merged_tablet_cnt_(0), merged_data_size_(0), smallest_snapshot_scn_(SCN::min_scn())
   {}
   ~ObMergeProgress() {}