diff --git a/source/dnode/vnode/src/tsdb/tsdbReadUtil.c b/source/dnode/vnode/src/tsdb/tsdbReadUtil.c
index 1a62c824d7..30186990ca 100644
--- a/source/dnode/vnode/src/tsdb/tsdbReadUtil.c
+++ b/source/dnode/vnode/src/tsdb/tsdbReadUtil.c
@@ -212,7 +212,7 @@ static void initLastProcKey(STableBlockScanInfo *pScanInfo, STsdbReader* pReader
   int32_t numOfPks = pReader->suppInfo.numOfPks;
   bool    asc = ASCENDING_TRAVERSE(pReader->info.order);
   int8_t  type = pReader->suppInfo.pk.type;
-  int8_t  bytes = pReader->suppInfo.pk.bytes;
+  int32_t bytes = pReader->suppInfo.pk.bytes;
 
   SRowKey* pRowKey = &pScanInfo->lastProcKey;
   if (asc) {