diff --git a/manifests/policy.pp b/manifests/policy.pp
index 84206a41..b4e16020 100644
--- a/manifests/policy.pp
+++ b/manifests/policy.pp
@@ -54,7 +54,7 @@
 define openstacklib::policy (
   Stdlib::Absolutepath $policy_path  = $name,
   Openstacklib::Policies $policies   = {},
-  $file_mode                         = '0640',
+  Stdlib::Filemode $file_mode        = '0640',
   $file_user                         = undef,
   $file_group                        = undef,
   Enum['yaml'] $file_format          = 'yaml',
diff --git a/manifests/policy/base.pp b/manifests/policy/base.pp
index 34a74210..56b6672d 100644
--- a/manifests/policy/base.pp
+++ b/manifests/policy/base.pp
@@ -40,7 +40,7 @@ define openstacklib::policy::base (
   Stdlib::Absolutepath $file_path,
   String[1] $key                    = $name,
   String $value                     = '',
-  $file_mode                        = '0640',
+  Stdlib::Filemode $file_mode       = '0640',
   $file_user                        = undef,
   $file_group                       = undef,
   Enum['yaml'] $file_format         = 'yaml',
diff --git a/manifests/policy/default.pp b/manifests/policy/default.pp
index 0c4353e7..2a990038 100644
--- a/manifests/policy/default.pp
+++ b/manifests/policy/default.pp
@@ -31,7 +31,7 @@
 #
 define openstacklib::policy::default (
   Stdlib::Absolutepath $file_path   = $name,
-  $file_mode                        = '0640',
+  Stdlib::Filemode $file_mode       = '0640',
   $file_user                        = undef,
   $file_group                       = undef,
   Enum['yaml'] $file_format         = 'yaml',