diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index 66a7b66d1b..04d6ec4126 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -184,12 +184,12 @@ static void getNextTimeWindow(SQueryAttr* pQueryAttr, STimeWindow* tw) {
   int mon = (int)(tm.tm_year * 12 + tm.tm_mon + interval * factor);
   tm.tm_year = mon / 12;
   tm.tm_mon = mon % 12;
-  tw->skey = convertTimePrecision(mktime(&tm) * 1000L, TSDB_TIME_PRECISION_MILLI, pQueryAttr->precision);
+  tw->skey = convertTimePrecision((int64_t)mktime(&tm) * 1000L, TSDB_TIME_PRECISION_MILLI, pQueryAttr->precision);
 
   mon = (int)(mon + interval);
   tm.tm_year = mon / 12;
   tm.tm_mon = mon % 12;
-  tw->ekey = convertTimePrecision(mktime(&tm) * 1000L, TSDB_TIME_PRECISION_MILLI, pQueryAttr->precision);
+  tw->ekey = convertTimePrecision((int64_t)mktime(&tm) * 1000L, TSDB_TIME_PRECISION_MILLI, pQueryAttr->precision);
 
   tw->ekey -= 1;
 }