diff --git a/manifests/init.pp b/manifests/init.pp
index 48d5508..118d509 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -76,12 +76,12 @@
   $allowed_hosts                                  = $nsclient::params::allowed_hosts,
   $service_state                                  = $nsclient::params::service_state,
   $service_enable                                 = $nsclient::params::service_enable,
-  $package_source_location                        = $nsclient::params::package_source_location,
-  $package_source                                 = $nsclient::params::package_source,
-  $package_name                                   = $nsclient::params::package_name,
+  String $package_source_location                 = $nsclient::params::package_source_location,
+  String $package_source                          = $nsclient::params::package_source,
+  String $package_name                            = $nsclient::params::package_name,
   $download_destination                           = $nsclient::params::download_destination,
-  $config_template                                = $nsclient::params::config_template,
-  $install_path                                   = $nsclient::params::install_path,
+  String $config_template                         = $nsclient::params::config_template,
+  String $install_path                            = $nsclient::params::install_path,
   Optional[String[1]] $password                   = $nsclient::params::password,
   Optional[String[1]] $proxy_url                  = $nsclient::params::proxy_url,
   Boolean $chocolatey_provider                    = $nsclient::params::chocolatey_provider,
@@ -89,12 +89,6 @@
   Optional[String[1]] $chocolatey_package_version = $nsclient::params::chocolatey_package_version
 ) inherits nsclient::params {
 
-  validate_string($package_source_location)
-  validate_string($package_source)
-  validate_string($package_name)
-  validate_string($config_template)
-  validate_string($install_path)
-
   class {'::nsclient::install':}
   -> class {'::nsclient::service':}
 
diff --git a/manifests/install.pp b/manifests/install.pp
index ae4ab60..965d3f3 100644
--- a/manifests/install.pp
+++ b/manifests/install.pp
@@ -9,10 +9,7 @@
 #
 class nsclient::install {
 
-  validate_string($nsclient::package_source_location)
-  validate_string($nsclient::package_source)
-  validate_string($nsclient::package_name)
-  validate_string($nsclient::install_path)
+  assert_private("You're not supposed to do that!")
 
   $source = "${nsclient::package_source_location}/${nsclient::package_source}"