diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index db97af616b251147aa7cf2465761dba993a086fc..fdecb6eda527a7888f2595662830cbea93a0801c 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -5015,7 +5015,7 @@ int32_t validateFillNode(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SSqlNode* pSqlNo
   
   if (pQueryInfo->fillVal == NULL) {
     pQueryInfo->fillVal      = calloc(numOfFields, sizeof(int64_t));
-    pQueryInfo->numOfFillVal = numOfFields;
+    pQueryInfo->numOfFillVal = (int32_t)numOfFields;
     if (pQueryInfo->fillVal == NULL) {
       return TSDB_CODE_TSC_OUT_OF_MEMORY;
     }