diff --git a/src/query/src/tdigest.c b/src/query/src/tdigest.c
index b3a557653d4c4622d45cf8946d952ceb9e80fc16..1ffc106ddeaa5409e4484702aa33aad6e3367a4f 100644
--- a/src/query/src/tdigest.c
+++ b/src/query/src/tdigest.c
@@ -123,7 +123,7 @@ void tdigestCompress(TDigest *t) {
 
     qsort(unmerged_centroids, num_unmerged, sizeof(Centroid), centroid_cmp);
     memset(&args, 0, sizeof(MergeArgs));
-    args.centroids = (Centroid*)malloc(sizeof(Centroid) * t->size);
+    args.centroids = (Centroid*)malloc((size_t)(sizeof(Centroid) * t->size));
     memset(args.centroids, 0, sizeof(Centroid) * t->size);
 
     args.t = t;