diff --git a/manifests/storage/server.pp b/manifests/storage/server.pp
index 1c03d5f3..6d47900a 100644
--- a/manifests/storage/server.pp
+++ b/manifests/storage/server.pp
@@ -101,7 +101,7 @@ define swift::storage::server(
     group   => $group,
     notify  => Service["swift-${type}", "swift-${type}-replicator"],
     require => Package['swift'],
-    mode    => 640,
+    mode    => '0640',
   }
 
   $required_middlewares = split(