diff --git a/roles/libvirt/setup/undercloud/templates/undercloudvm.xml.j2 b/roles/libvirt/setup/undercloud/templates/undercloudvm.xml.j2
index f51aa70d2..675d3df8d 100644
--- a/roles/libvirt/setup/undercloud/templates/undercloudvm.xml.j2
+++ b/roles/libvirt/setup/undercloud/templates/undercloudvm.xml.j2
@@ -17,7 +17,7 @@
 {% if overcloud_as_undercloud|bool or undercloud_use_custom_boot_images|bool %}
     <kernel>{{ undercloud_custom_vmlinuz }}</kernel>
     <initrd>{{ undercloud_custom_initrd }}</initrd>
-    <cmdline>console=ttyS0 root=/dev/vda</cmdline>
+    <cmdline>console=ttyS0 root=/dev/vda {{ undercloud_extra_grub_params|default('') }}</cmdline>
 {% endif %}
   </os>
   <features>