diff --git a/source/dnode/vnode/src/tsdb/tsdbCache.c b/source/dnode/vnode/src/tsdb/tsdbCache.c
index 3ca2846d07..0f5511d658 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCache.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCache.c
@@ -1875,7 +1875,7 @@ static int32_t lastIterOpen(SFSLastIter *iter, STFileSet *pFileSet, STsdb *pTsdb
       .backward = 1,
       .pSttFileBlockIterArray = pr->pLDataIterArray,
       .pCols = aCols,
-      .numOfCols = nCols,
+      .numOfCols = nCols + 1,
       .loadTombFn = loadSttTomb,
       .pReader = pr,
       .idstr = pr->idstr,