diff --git a/src/tsdb/src/tsdbRWHelper.c b/src/tsdb/src/tsdbRWHelper.c
index f43d10918d70535d8264d572f16d1610fb295d7c..7bb59dd47f93e4ca6f03d73fd55425a133001f6e 100644
--- a/src/tsdb/src/tsdbRWHelper.c
+++ b/src/tsdb/src/tsdbRWHelper.c
@@ -1534,6 +1534,7 @@ static int tsdbLoadAndMergeFromCache(SDataCols *pDataCols, int *iter, SCommitIte
         dataColAppendVal(pTarget->cols + i, tdGetColDataOfRow(pDataCols->cols + i, *iter), pTarget->numOfRows,
                          pTarget->maxPoints);
       }
+      pTarget->numOfRows++;
       (*iter)++;
       if (key1 == key2) tSkipListIterNext(pCommitIter->pIter);
     } else {