diff --git a/src/query/src/qAggMain.c b/src/query/src/qAggMain.c
index 5d6a3d31cc7d47b6578c9aa8a1c6dc092190d53d..5d1553895dcbd30ef4eeacf4a16cbc0e1cc57353 100644
--- a/src/query/src/qAggMain.c
+++ b/src/query/src/qAggMain.c
@@ -290,7 +290,7 @@ int32_t getResultDataInfo(int32_t dataType, int32_t dataBytes, int32_t functionI
     } else if (functionId == TSDB_FUNC_APERCT) {
       *type = TSDB_DATA_TYPE_BINARY;
       int16_t bytesHist = sizeof(SHistBin) * (MAX_HISTOGRAM_BIN + 1) + sizeof(SHistogramInfo) + sizeof(SAPercentileInfo);
-      int16_t bytesDigest = sizeof(SAPercentileInfo) + TDIGEST_SIZE(COMPRESSION);
+      int16_t bytesDigest = (int16_t)(sizeof(SAPercentileInfo) + TDIGEST_SIZE(COMPRESSION));
       *bytes = MAX(bytesHist, bytesDigest);
       *interBytes = *bytes;