diff --git a/src/query/src/qUtil.c b/src/query/src/qUtil.c
index 3970da59d497060087e21eff3932c16e36ddf55e..6271fab7a86a80182d9f469d95c1026b8788122d 100644
--- a/src/query/src/qUtil.c
+++ b/src/query/src/qUtil.c
@@ -626,7 +626,7 @@ void blockDistInfoFromBinary(const char* data, int32_t len, STableBlockDist* pDi
   bool comp = tbufReadUint8(&br);
   uint32_t compLen = tbufReadUint32(&br);
 
-  size_t originalLen = numOfBlocks*sizeof(SFileBlockInfo);
+  size_t originalLen = (size_t) (numOfBlocks*sizeof(SFileBlockInfo));
 
   char* outputBuf = NULL;
   if (comp) {