diff --git a/source/dnode/vnode/src/tsdb/tsdbRead2.c b/source/dnode/vnode/src/tsdb/tsdbRead2.c
index 90a26d17dc..d740f9491c 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead2.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead2.c
@@ -658,11 +658,12 @@ static int32_t doCopyColVal(SColumnInfoData* pColInfoData, int32_t rowIndex, int
       colDataSetNULL(pColInfoData, rowIndex);
     } else {
       varDataSetLen(pSup->buildBuf[colIndex], pColVal->value.nData);
-      if (pColVal->value.nData > pColInfoData->info.bytes) {
+      if ((pColVal->value.nData + VARSTR_HEADER_SIZE) > pColInfoData->info.bytes) {
         tsdbWarn("column cid:%d actual data len %d is bigger than schema len %d", pColVal->cid, pColVal->value.nData,
                  pColInfoData->info.bytes);
         return TSDB_CODE_TDB_INVALID_TABLE_SCHEMA_VER;
       }
+
       if (pColVal->value.nData > 0) {  // pData may be null, if nData is 0
         memcpy(varDataVal(pSup->buildBuf[colIndex]), pColVal->value.pData, pColVal->value.nData);
       }