diff --git a/manifests/init.pp b/manifests/init.pp
index 74fcd75..a737032 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -18,8 +18,8 @@
   $log_options                                                     = $chrony::params::log_options,
   $package_ensure                                                  = $chrony::params::package_ensure,
   $package_name                                                    = $chrony::params::package_name,
-  $package_source                                                  = $chrony::package_source,
-  $package_provider                                                = $chrony::package_provider,
+  Optional[String] $package_source                                 = $chrony::params::package_source,
+  Optional[String] $package_provider                               = $chrony::params::package_provider,
   $refclocks                                                       = $chrony::params::refclocks,
   $peers                                                           = $chrony::params::peers,
   $servers                                                         = $chrony::params::servers,
diff --git a/manifests/params.pp b/manifests/params.pp
index fc0f959..0b8fed6 100644
--- a/manifests/params.pp
+++ b/manifests/params.pp
@@ -4,6 +4,8 @@
   $keys               = []
   $log_options        = undef
   $package_ensure     = 'present'
+  $package_provider   = undef
+  $package_source     = undef
   $refclocks          = []
   $peers              = []
   $service_enable     = true