diff --git a/manifests/compute/rbd.pp b/manifests/compute/rbd.pp
index 143a53b43..44b201f0e 100644
--- a/manifests/compute/rbd.pp
+++ b/manifests/compute/rbd.pp
@@ -106,7 +106,7 @@ class nova::compute::rbd (
     #resource.
     $cm = '/usr/bin/virsh secret-define --file /etc/nova/secret.xml | /usr/bin/awk \'{print $2}\' | sed \'/^$/d\' > /etc/nova/virsh.secret'
     exec { 'get-or-set virsh secret':
-      command => "${cm}",
+      command => $cm,
       unless  => "/usr/bin/virsh secret-list | grep ${libvirt_rbd_secret_uuid}",
       require => [File['/etc/nova/secret.xml'], Service['libvirt']],
     }