diff --git a/roles/tftp_server/tasks/main.yml b/roles/tftp_server/tasks/main.yml
index b468006853..6e144cfe8c 100644
--- a/roles/tftp_server/tasks/main.yml
+++ b/roles/tftp_server/tasks/main.yml
@@ -43,7 +43,7 @@
 
 - name: generate custom configs
   template: src=grubhost.cfg dest="/var/lib/tftpboot/uefi/{{ item.install_mac }}"
-  with_items: {{ groups['all'] }}
+  with_items: "{{ groups['all'] }}"
   when: "hostvars[item].install_noc == ansible_inventory_hostname"
   tags:
   - tftp_server