diff --git a/src/query/inc/qpercentile.h b/src/query/inc/qpercentile.h
index f8f09357c635afd096cab622daab186eb2fbc512..c1227dad77d278d9534df229b8a68c2b4f305a54 100644
--- a/src/query/inc/qpercentile.h
+++ b/src/query/inc/qpercentile.h
@@ -49,7 +49,7 @@ typedef struct tMemBucket {
   int32_t nTotalBufferSize;
   int32_t maxElemsCapacity;
   
-  int16_t pageSize;
+  int32_t pageSize;
   int16_t numOfTotalPages;
   int16_t numOfAvailPages; /* remain available buffer pages */