diff --git a/playbooks/include/deploy-kvm-guest.yml b/playbooks/include/deploy-kvm-guest.yml
index db5c6c1..bc34ec8 100644
--- a/playbooks/include/deploy-kvm-guest.yml
+++ b/playbooks/include/deploy-kvm-guest.yml
@@ -35,9 +35,11 @@
       {% endfor %}
 
     virt_install_passthrough: >-
-      {% for item in passthrough_devices %}
+      {% if passthrough_devices is defined %}
+      {%   for item in passthrough_devices %}
       --hostdev {{ item }}
-      {% endfor %}
+      {%   endfor %}
+      {% endif %}
 
   tasks: