diff --git a/manifests/init.pp b/manifests/init.pp
index 59b4a936..c23eb005 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -259,7 +259,7 @@ class sahara(
   $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,
   $default_ntp_server          = $facts['os_service_default'],
 ) {
 
diff --git a/manifests/policy.pp b/manifests/policy.pp
index 51b4848e..35a70584 100644
--- a/manifests/policy.pp
+++ b/manifests/policy.pp
@@ -52,7 +52,7 @@ class sahara::policy (
   $policy_path          = '/etc/sahara/policy.yaml',
   $policy_default_rule  = $facts['os_service_default'],
   $policy_dirs          = $facts['os_service_default'],
-  $purge_config         = false,
+  Boolean $purge_config = false,
 ) {
 
   include sahara::deps