diff --git a/source/util/src/tdigest.c b/source/util/src/tdigest.c
index 1b9edf79a0..dc2a943de9 100644
--- a/source/util/src/tdigest.c
+++ b/source/util/src/tdigest.c
@@ -263,7 +263,7 @@ double tdigestQuantile(TDigest *t, double q) {
     b = c;
     right = (b->weight * a->mean + a->weight * b->mean) / (a->weight + b->weight);
     if (idx < weight_so_far + a->weight) {
-      double p = (idx - weight_so_far) / (a->weight == 0) ? 1 : a->weight;
+      double p = (idx - weight_so_far) / ((a->weight == 0) ? 1 : a->weight);
       return left * (1 - p) + right * p;
     }
     weight_so_far += a->weight;