diff --git a/manifests/init.pp b/manifests/init.pp
index b9139b9..d4a71f9 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -212,7 +212,7 @@ class magnum(
   $amqp_sasl_config_name              = $facts['os_service_default'],
   $amqp_username                      = $facts['os_service_default'],
   $amqp_password                      = $facts['os_service_default'],
-  $purge_config                       = false,
+  Boolean $purge_config               = false,
 ) {
 
   include magnum::deps
diff --git a/manifests/policy.pp b/manifests/policy.pp
index 62cea9a..efeac5c 100644
--- a/manifests/policy.pp
+++ b/manifests/policy.pp
@@ -52,7 +52,7 @@ class magnum::policy (
   $policy_path          = '/etc/magnum/policy.yaml',
   $policy_default_rule  = $facts['os_service_default'],
   $policy_dirs          = $facts['os_service_default'],
-  $purge_config         = false,
+  Boolean $purge_config = false,
 ) {
 
   include magnum::deps