diff --git a/manifests/keystone/auth.pp b/manifests/keystone/auth.pp
index d16cd6a..1f08864 100644
--- a/manifests/keystone/auth.pp
+++ b/manifests/keystone/auth.pp
@@ -43,7 +43,7 @@
 #
 # [*service_name*]
 #   (optional) Name of the service.
-#   Defaults to the value of auth_name.
+#   Defaults to 'mistral'.
 #
 # [*configure_service*]
 #   Should mistral service be configured? Defaults to 'true'.
@@ -60,7 +60,7 @@ class mistral::keystone::auth(
   $password,
   $email                  = 'mistral@localhost',
   $auth_name              = 'mistral',
-  $service_name           = undef,
+  $service_name           = 'mistral',
   $service_type           = 'workflowv2',
   $public_url             = 'http://127.0.0.1:8989/v2',
   $admin_url              = 'http://127.0.0.1:8989/v2',
@@ -76,20 +76,15 @@ class mistral::keystone::auth(
 
   validate_string($password)
 
-  if $service_name == undef {
-    $real_service_name = $auth_name
-  } else {
-    $real_service_name = $service_name
-  }
-
-  keystone::resource::service_identity { $auth_name:
+  keystone::resource::service_identity { 'mistral':
     configure_user      => $configure_user,
     configure_user_role => $configure_user_role,
     configure_endpoint  => $configure_endpoint,
     service_type        => $service_type,
     service_description => $service_description,
-    service_name        => $real_service_name,
+    service_name        => $service_name,
     region              => $region,
+    auth_name           => $auth_name,
     password            => $password,
     email               => $email,
     tenant              => $tenant,
diff --git a/releasenotes/notes/keystone-auth-name-6717f5018361ef99.yaml b/releasenotes/notes/keystone-auth-name-6717f5018361ef99.yaml
new file mode 100644
index 0000000..835c883
--- /dev/null
+++ b/releasenotes/notes/keystone-auth-name-6717f5018361ef99.yaml
@@ -0,0 +1,5 @@
+---
+fixes:
+  - The keystone auth class has been updated to provide a default service_name
+    to allow a user to specify a custom auth_name that may not contain the
+    name of the service.
diff --git a/spec/classes/mistral_keystone_auth_spec.rb b/spec/classes/mistral_keystone_auth_spec.rb
index 7a5763f..c936e33 100644
--- a/spec/classes/mistral_keystone_auth_spec.rb
+++ b/spec/classes/mistral_keystone_auth_spec.rb
@@ -39,10 +39,11 @@ describe 'mistral::keystone::auth' do
     ) }
   end
 
-  describe 'when overriding auth name' do
+  describe 'when overriding auth and service name' do
     let :params do
-      { :password => 'foo',
-        :auth_name => 'mistraly' }
+      { :service_name => 'mistraly',
+        :auth_name    => 'mistraly',
+        :password     => 'mistral_password' }
     end
 
     it { is_expected.to contain_keystone_user('mistraly') }
@@ -51,19 +52,6 @@ describe 'mistral::keystone::auth' do
     it { is_expected.to contain_keystone_endpoint('RegionOne/mistraly::workflowv2') }
   end
 
-  describe 'when overriding service name' do
-    let :params do
-      { :service_name => 'mistral_service',
-        :auth_name    => 'mistral',
-        :password     => 'mistral_password' }
-    end
-
-    it { is_expected.to contain_keystone_user('mistral') }
-    it { is_expected.to contain_keystone_user_role('mistral@services') }
-    it { is_expected.to contain_keystone_service('mistral_service::workflowv2') }
-    it { is_expected.to contain_keystone_endpoint('RegionOne/mistral_service::workflowv2') }
-  end
-
   describe 'when disabling user configuration' do
 
     let :params do