diff --git a/src/query/src/tdigest.c b/src/query/src/tdigest.c
index 1ffc106ddeaa5409e4484702aa33aad6e3367a4f..0f47e93d7de59c6b13a56d0b6ecd918c579b4104 100644
--- a/src/query/src/tdigest.c
+++ b/src/query/src/tdigest.c
@@ -124,7 +124,7 @@ void tdigestCompress(TDigest *t) {
     qsort(unmerged_centroids, num_unmerged, sizeof(Centroid), centroid_cmp);
     memset(&args, 0, sizeof(MergeArgs));
     args.centroids = (Centroid*)malloc((size_t)(sizeof(Centroid) * t->size));
-    memset(args.centroids, 0, sizeof(Centroid) * t->size);
+    memset(args.centroids, 0, (size_t)(sizeof(Centroid) * t->size));
 
     args.t = t;
     args.min = INFINITY;