diff --git a/src/query/src/qPercentile.c b/src/query/src/qPercentile.c
index 3a8be781d5..ab9ffb7bcb 100644
--- a/src/query/src/qPercentile.c
+++ b/src/query/src/qPercentile.c
@@ -365,7 +365,7 @@ void tMemBucketDestroy(tMemBucket *pBucket) {
   taosTFree(pBucket);
 }
 
-void tMemBucketUpdateBoundingBox(MinMaxEntry *r, char *data, int32_t dataType) {
+void tMemBucketUpdateBoundingBox(MinMaxEntry *r, const char *data, int32_t dataType) {
   switch (dataType) {
     case TSDB_DATA_TYPE_INT: {
       int32_t val = *(int32_t *)data;