diff --git a/manifests/init.pp b/manifests/init.pp
index 1a0762c..77c3fc3 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -270,7 +270,7 @@ class cloudkitty(
   $rpc_response_timeout               = $facts['os_service_default'],
   $control_exchange                   = $facts['os_service_default'],
   $notification_transport_url         = $facts['os_service_default'],
-  $purge_config                       = false,
+  Boolean $purge_config               = false,
   $auth_strategy                      = 'keystone',
   $api_paste_config                   = $facts['os_service_default'],
   $host                               = $facts['os_service_default'],
diff --git a/manifests/policy.pp b/manifests/policy.pp
index f437306..b79431e 100644
--- a/manifests/policy.pp
+++ b/manifests/policy.pp
@@ -52,7 +52,7 @@ class cloudkitty::policy (
   $policy_path          = '/etc/cloudkitty/policy.yaml',
   $policy_default_rule  = $facts['os_service_default'],
   $policy_dirs          = $facts['os_service_default'],
-  $purge_config         = false,
+  Boolean $purge_config = false,
 ) {
 
   include cloudkitty::deps