diff --git a/source/dnode/vnode/src/tsdb/tsdbRead.c b/source/dnode/vnode/src/tsdb/tsdbRead.c
index f1a1ee1a4b..bd46bab84e 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead.c
@@ -4349,9 +4349,7 @@ int32_t tsdbGetFileBlocksDistInfo(STsdbReader* pReader, STableBlockDistInfo* pTa
         pTableBlockInfo->numOfSmallBlocks += 1;
       }
 
-      for (int32_t i = 0; i < pBlock->nSubBlock; i++) {
-        pTableBlockInfo->totalSize += pBlock->aSubBlock[i].szBlock;
-      }
+      pTableBlockInfo->totalSize = pBlock->aSubBlock[0].szBlock;
 
       int32_t bucketIndex = getBucketIndex(pTableBlockInfo->defMinRows, bucketRange, numOfRows);
       pTableBlockInfo->blockRowsHisto[bucketIndex]++;