diff --git a/source/common/src/tdatablock.c b/source/common/src/tdatablock.c
index f7b1196248..3c2a5377e3 100644
--- a/source/common/src/tdatablock.c
+++ b/source/common/src/tdatablock.c
@@ -1403,6 +1403,7 @@ SSDataBlock* createOneDataBlock(const SSDataBlock* pDataBlock, bool copyData) {
   pBlock->info = pDataBlock->info;
   pBlock->info.rows = 0;
   pBlock->info.capacity = 0;
+  pBlock->info.rowSize = 0;
 
   size_t numOfCols = taosArrayGetSize(pDataBlock->pDataBlock);
   for (int32_t i = 0; i < numOfCols; ++i) {