diff --git a/manifests/init.pp b/manifests/init.pp
index 4437de0d8..8a4d97996 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -439,7 +439,7 @@ class nova(
   $initial_cpu_allocation_ratio           = $facts['os_service_default'],
   $initial_ram_allocation_ratio           = $facts['os_service_default'],
   $initial_disk_allocation_ratio          = $facts['os_service_default'],
-  $purge_config                           = false,
+  Boolean $purge_config                   = false,
   $my_ip                                  = $facts['os_service_default'],
   $dhcp_domain                            = $facts['os_service_default'],
   $instance_name_template                 = $facts['os_service_default'],
diff --git a/manifests/policy.pp b/manifests/policy.pp
index 9736d33e5..522f0bc1e 100644
--- a/manifests/policy.pp
+++ b/manifests/policy.pp
@@ -52,7 +52,7 @@ class nova::policy (
   $policy_path          = '/etc/nova/policy.yaml',
   $policy_default_rule  = $facts['os_service_default'],
   $policy_dirs          = $facts['os_service_default'],
-  $purge_config         = false,
+  Boolean $purge_config = false,
 ) {
 
   include nova::deps