rax cdn unit tests
diff --git a/rackspace/objectstorage/v1/cdncontainers/delegate.go b/rackspace/objectstorage/v1/cdncontainers/delegate.go
index 40c4ed1..f5e8cdd 100644
--- a/rackspace/objectstorage/v1/cdncontainers/delegate.go
+++ b/rackspace/objectstorage/v1/cdncontainers/delegate.go
@@ -33,7 +33,7 @@
// List is a function that retrieves containers associated with the account as
// well as account metadata. It returns a pager which can be iterated with the
// EachPage function.
-func List(c *gophercloud.ServiceClient, opts *ListOpts) pagination.Pager {
+func List(c *gophercloud.ServiceClient, opts os.ListOptsBuilder) pagination.Pager {
return os.List(c, opts)
}