diff --git a/client/modules/IDE/components/PreviewFrame.js b/client/modules/IDE/components/PreviewFrame.js
index f02901ae..434ae9c1 100644
--- a/client/modules/IDE/components/PreviewFrame.js
+++ b/client/modules/IDE/components/PreviewFrame.js
@@ -242,6 +242,8 @@ class PreviewFrame extends React.Component {
 
 PreviewFrame.propTypes = {
   isPlaying: PropTypes.bool.isRequired,
+  isTextOutputPlaying: PropTypes.bool.isRequired,
+  textOutput: PropTypes.bool.isRequired,
   head: PropTypes.object.isRequired,
   content: PropTypes.string,
   htmlFile: PropTypes.shape({