diff --git a/cpp/src/neighbors/detail/nn_descent.cuh b/cpp/src/neighbors/detail/nn_descent.cuh
index 432cde7ffc..ce8b089be3 100644
--- a/cpp/src/neighbors/detail/nn_descent.cuh
+++ b/cpp/src/neighbors/detail/nn_descent.cuh
@@ -549,7 +549,7 @@ __device__ __forceinline__ void calculate_metric(float* s_distances,
       } else if (metric == cuvs::distance::DistanceType::L2Expanded ||
                  metric == cuvs::distance::DistanceType::L2SqrtExpanded) {
         s_distances[i] =
-          l2_norms[row_neighbors[row_id]] + l2_norms[col_neighbors[col_id]] - 2.0 * s_distances[i];
+          l2_norms[row_neighbors[row_id]] + l2_norms[col_neighbors[col_id]] - 2.0f * s_distances[i];
         // for fp32 vs fp16 precision differences resulting in negative distances when distance
         // should be 0 related issue: https://github.com/nvidia/cuvs/issues/991
         s_distances[i] = s_distances[i] < 0.0f ? 0.0f : s_distances[i];