diff --git a/openstack-ood/nodeimage.pkr.hcl b/openstack-ood/nodeimage.pkr.hcl
index 2dd0a8d18700043ca53fb46e35c1db72658212f1..f84ee061431f5778486ca312445e5bfa77c3b9df 100644
--- a/openstack-ood/nodeimage.pkr.hcl
+++ b/openstack-ood/nodeimage.pkr.hcl
@@ -1,5 +1,5 @@
 locals {
-    local_image_name = "${var.image_name}${var.image_date_suffix ? formatdate("YYYYMMDDHHmm", timestamp()): ""}"
+    local_image_name = "${var.image_name}${var.image_date_suffix ? formatdate("-YYYYMMDDHHmm", timestamp()): ""}"
 }
 
 source "openstack" "image" {
diff --git a/openstack/nodeimage.pkr.hcl b/openstack/nodeimage.pkr.hcl
index a678e99592a561374ba90d6ebbd8e906401039e1..6e74b5c1bffa5603d7b4fcae50e7017e03dc033d 100644
--- a/openstack/nodeimage.pkr.hcl
+++ b/openstack/nodeimage.pkr.hcl
@@ -1,5 +1,5 @@
 locals {
-    local_image_name = "${var.image_name}${var.image_date_suffix ? formatdate("YYYYMMDDHHmm", timestamp()): ""}"
+    local_image_name = "${var.image_name}${var.image_date_suffix ? formatdate("-YYYYMMDDHHmm", timestamp()): ""}"
 }
 
 source "openstack" "image" {