diff --git a/src/query/src/qFill.c b/src/query/src/qFill.c
index ef4176471b31217c9ae8d7cab9fa403f353dbc4a..810140e8f354f2521f8592a2db90adb001c6020e 100644
--- a/src/query/src/qFill.c
+++ b/src/query/src/qFill.c
@@ -447,7 +447,7 @@ void taosFillCopyInputDataFromOneFilePage(SFillInfo* pFillInfo, const tFilePage*
 
     const char* data = pInput->data + pCol->col.offset * pInput->num;
     if (pInput->num > pFillInfo->alloc) {
-      char* t = realloc(pFillInfo->pData[i], pCol->col.bytes * pInput->num);
+      char* t = realloc(pFillInfo->pData[i], (size_t)(pCol->col.bytes * pInput->num));
       assert(t != NULL);
 
       pFillInfo->pData[i] = t;