diff --git a/manifests/proxy/cname_lookup.pp b/manifests/proxy/cname_lookup.pp
index c9447a54..89721f65 100644
--- a/manifests/proxy/cname_lookup.pp
+++ b/manifests/proxy/cname_lookup.pp
@@ -66,7 +66,7 @@ class swift::proxy::cname_lookup (
     'filter:cname_lookup/set log_address':  value => $log_address;
     'filter:cname_lookup/storage_domain' :  value => $storage_domain;
     'filter:cname_lookup/lookup_depth' :    value => $lookup_depth;
-    'filter:cname_lookup/nameservers' :     value => $nameservers;
+    'filter:cname_lookup/nameservers' :     value => join(any2array($nameservers), ',');
   }
 
   package { 'python-dnspython':
diff --git a/spec/classes/swift_proxy_cname_lookup_spec.rb b/spec/classes/swift_proxy_cname_lookup_spec.rb
index 12159235..508ae656 100644
--- a/spec/classes/swift_proxy_cname_lookup_spec.rb
+++ b/spec/classes/swift_proxy_cname_lookup_spec.rb
@@ -41,6 +41,16 @@ describe 'swift::proxy::cname_lookup' do
       it { is_expected.to contain_swift_proxy_config('filter:cname_lookup/lookup_depth').with_value('2') }
       it { is_expected.to contain_swift_proxy_config('filter:cname_lookup/nameservers').with_value('8.8.8.8') }
     end
+
+    describe "when nameservers parameter accept an array" do
+      let :params do
+        {
+          :nameservers => ['8.8.8.8', '8.8.4.4'],
+        }
+      end
+
+      it { is_expected.to contain_swift_proxy_config('filter:cname_lookup/nameservers').with_value('8.8.8.8,8.8.4.4') }
+    end
   end
 
   on_supported_os({