diff --git a/source/dnode/vnode/src/tsdb/tsdbSnapshot.c b/source/dnode/vnode/src/tsdb/tsdbSnapshot.c
index 502d227121c8019406ce589fe6960b3a680b69bd..99e88a442c16e77f2db2ca752eb54f4e120532f8 100644
--- a/source/dnode/vnode/src/tsdb/tsdbSnapshot.c
+++ b/source/dnode/vnode/src/tsdb/tsdbSnapshot.c
@@ -51,7 +51,7 @@ struct STsdbSnapReader {
   SDataFReader* pDataFReader;
   SFDataIter*   pIter;
   SRBTree       rbt;
-  SFDataIter    aFDataIter[TSDB_MAX_STT_FILE + 1];
+  SFDataIter    aFDataIter[TSDB_MAX_STT_TRIGGER + 1];
   SBlockData    bData;
   SSkmInfo      skmTable;
   // for del file