diff --git a/examples/nvme/hello_world/hello_world.c b/examples/nvme/hello_world/hello_world.c
index 29bb583a0..ed1a91513 100644
--- a/examples/nvme/hello_world/hello_world.c
+++ b/examples/nvme/hello_world/hello_world.c
@@ -321,7 +321,7 @@ static void
 attach_cb(void *cb_ctx, const struct spdk_nvme_transport_id *trid,
 	  struct spdk_nvme_ctrlr *ctrlr, const struct spdk_nvme_ctrlr_opts *opts)
 {
-	int nsid, num_ns;
+	int nsid;
 	struct ctrlr_entry *entry;
 	struct spdk_nvme_ns *ns;
 	const struct spdk_nvme_ctrlr_data *cdata;
@@ -357,9 +357,8 @@ attach_cb(void *cb_ctx, const struct spdk_nvme_transport_id *trid,
 	 *
 	 * Note that in NVMe, namespace IDs start at 1, not 0.
 	 */
-	num_ns = spdk_nvme_ctrlr_get_num_ns(ctrlr);
-	printf("Using controller %s with %d namespaces.\n", entry->name, num_ns);
-	for (nsid = 1; nsid <= num_ns; nsid++) {
+	for (nsid = spdk_nvme_ctrlr_get_first_active_ns(ctrlr); nsid != 0;
+	     nsid = spdk_nvme_ctrlr_get_next_active_ns(ctrlr, nsid)) {
 		ns = spdk_nvme_ctrlr_get_ns(ctrlr, nsid);
 		if (ns == NULL) {
 			continue;