diff --git a/ohpc-instance/main.tf b/ohpc-instance/main.tf
index 55ca66011b364ebf331eedd7e38e94b263b7e331..bbc760572c5ba3c472b42b1d86960318d3957cd0 100644
--- a/ohpc-instance/main.tf
+++ b/ohpc-instance/main.tf
@@ -80,5 +80,5 @@ output "ssh_host" {
 }
 
 output "device" {
-    value = openstack_compute_volume_attach_v2.volume_attach.device
+    value = openstack_compute_volume_attach_v2.volume_attach[count.index].device
 }