diff --git a/manifests/keymaster.pp b/manifests/keymaster.pp
index 1b109855..7be8ec9d 100644
--- a/manifests/keymaster.pp
+++ b/manifests/keymaster.pp
@@ -58,7 +58,7 @@
 #
 # [*meta_version_to_write*]
 #   (Optional) Int. The version of crypto metadata to write.
-#   Defaults to 1.
+#   Defaults to $::os_service_default
 #
 # == Dependencies
 #
@@ -80,7 +80,7 @@ class swift::keymaster(
   $user_domain_name      = undef,
   $project_domain_id     = 'default',
   $user_domain_id        = 'default',
-  $meta_version_to_write = 1,
+  $meta_version_to_write = $::os_service_default,
 ) {
 
   include swift::deps
diff --git a/spec/classes/swift_keymaster.rb b/spec/classes/swift_keymaster.rb
index 8b8aa5d3..bdb7de27 100644
--- a/spec/classes/swift_keymaster.rb
+++ b/spec/classes/swift_keymaster.rb
@@ -8,7 +8,7 @@ describe 'swift::keymaster' do
       it { is_expected.to contain_swift_keymaster_config('kms_keymaster/project_name').with_value('services') }
       it { is_expected.to contain_swift_keymaster_config('kms_keymaster/project_domain_id').with_value('default') }
       it { is_expected.to contain_swift_keymaster_config('kms_keymaster/user_domain_id').with_value('default') }
-      it { is_expected.to contain_swift_keymaster_config('kms_keymaster/meta_version_to_write').with_value('1') }
+      it { is_expected.to contain_swift_keymaster_config('kms_keymaster/meta_version_to_write').with_value('<SERVICE DEFAULT>') }
     end
 
     describe "when overriding default parameters" do