diff --git a/codec/decoder/core/src/decoder_core.cpp b/codec/decoder/core/src/decoder_core.cpp
index ab7c9655..4f434eb8 100644
--- a/codec/decoder/core/src/decoder_core.cpp
+++ b/codec/decoder/core/src/decoder_core.cpp
@@ -1762,7 +1762,7 @@ int32_t ConstructAccessUnit (PWelsDecoderContext pCtx, uint8_t** ppDst, SBufferI
   iErr = DecodeCurrentAccessUnit (pCtx, ppDst, pDstInfo);
 
   if (pCtx->bParseOnly) {
-    if ((dsErrorFree == pCtx->iErrorCode) && (pCtx->iTotalNumMbRec == pCtx->pSps->iMbHeight * pCtx->pSps->iMbWidth)) {
+    if ((dsErrorFree == pCtx->iErrorCode) && ((uint32_t) pCtx->iTotalNumMbRec == pCtx->pSps->iMbHeight * pCtx->pSps->iMbWidth)) {
       SParserBsInfo* pParser = pCtx->pParserBsInfo;
       uint8_t* pDstBuf = pParser->pDstBuff;
       SNalUnit* pCurNal = NULL;