diff --git a/lib/rack-cas/service_validation_response.rb b/lib/rack-cas/service_validation_response.rb
index 1e1b7ec..3cf973d 100644
--- a/lib/rack-cas/service_validation_response.rb
+++ b/lib/rack-cas/service_validation_response.rb
@@ -53,6 +53,9 @@ def extra_attributes
             if !node.namespace || !node.namespace.prefix == 'cas'
               # TODO: support JSON encoding
               attrs[node.name] = YAML.load node.text.strip
+            else
+              attrs['cas'] = {} unless attrs['cas']
+              attrs['cas'][node.name] = YAML.load(node.text.strip)
             end
           end
         end