diff --git a/manifests/sink.pp b/manifests/sink.pp
index 35111ceb..c85cbffc 100644
--- a/manifests/sink.pp
+++ b/manifests/sink.pp
@@ -46,11 +46,11 @@ class designate::sink (
 
   if $enabled_notification_handlers {
     designate_config {
-      'service:sink/enabled_notification_handlers':  value => join($enabled_notification_handlers,',')
+      'service:sink/enabled_notification_handlers': value => join(any2array($enabled_notification_handlers),',')
     }
   } else {
     designate_config {
-      'service:sink/enabled_notification_handlers':  ensure => absent
+      'service:sink/enabled_notification_handlers': ensure => absent
     }
   }
 
diff --git a/spec/classes/designate_sink_spec.rb b/spec/classes/designate_sink_spec.rb
index 52635df7..27dab087 100644
--- a/spec/classes/designate_sink_spec.rb
+++ b/spec/classes/designate_sink_spec.rb
@@ -26,12 +26,27 @@ describe 'designate::sink' do
         )
         is_expected.to contain_designate_config('service:sink/enabled_notification_handlers').with_ensure('absent')
       end
+    end
 
-      context 'when using enabled_notification_handlers' do
-        before { params.merge!(:enabled_notification_handlers => ['nova_fixed','neutron_floatingip']) }
-        it 'configures designate-sink with enabled_notification_handlers' do
-          is_expected.to contain_designate_config('service:sink/enabled_notification_handlers').with_value(['nova_fixed,neutron_floatingip'])
-        end
+    context 'with enabled_notification_handlers (array)' do
+      before do
+        params.merge!(
+          :enabled_notification_handlers => ['nova_fixed', 'neutron_floatingip']
+        )
+      end
+      it 'configures designate-sink with enabled_notification_handlers' do
+        is_expected.to contain_designate_config('service:sink/enabled_notification_handlers').with_value('nova_fixed,neutron_floatingip')
+      end
+    end
+
+    context 'with enabled_notification_handlers (string)' do
+      before do
+        params.merge!(
+          :enabled_notification_handlers => 'nova_fixed,neutron_floatingip'
+        )
+      end
+      it 'configures designate-sink with enabled_notification_handlers' do
+        is_expected.to contain_designate_config('service:sink/enabled_notification_handlers').with_value('nova_fixed,neutron_floatingip')
       end
     end