diff --git a/src/query/src/qAggMain.c b/src/query/src/qAggMain.c
index d1a3334aa28aae2730161991a3e40d913a396496..e3dab4750c456fe7c028cfe2ea1d5e531a5695b2 100644
--- a/src/query/src/qAggMain.c
+++ b/src/query/src/qAggMain.c
@@ -5012,7 +5012,7 @@ static void histogram_function(SQLFunctionCtx *pCtx) {
 
   if (pRes->normalized) {
     for (int32_t b = 0; b < pRes->numOfBins; ++b) {
-      pRes->orderedBins[b].count_norm = pRes->orderedBins[b].count / totalElems;
+      pRes->orderedBins[b].count_norm = pRes->orderedBins[b].count / (double)totalElems;
     }
   }