diff --git a/nvme-topology.c b/nvme-topology.c
index 74cfe2b5..48d43642 100644
--- a/nvme-topology.c
+++ b/nvme-topology.c
@@ -357,9 +357,9 @@ static int verify_legacy_ns(struct nvme_namespace *n)
 		char tmp_address[64] = "";
 		legacy_get_pci_bdf(path, tmp_address);
 		if (tmp_address[0]) {
-			if (asprintf(&n->ctrl->transport, "pcie") != 1)
+			if (asprintf(&n->ctrl->transport, "pcie") < 0)
 				return -1;
-			if (asprintf(&n->ctrl->address, "%s", tmp_address) != 1)
+			if (asprintf(&n->ctrl->address, "%s", tmp_address) < 0)
 				return -1;
 		}
 	}