diff --git a/demos/blockfactory/factory.js b/demos/blockfactory/factory.js
index 667d6216b..4aa9dee5b 100644
--- a/demos/blockfactory/factory.js
+++ b/demos/blockfactory/factory.js
@@ -401,7 +401,9 @@ function updatePreview() {
     }
     var rtl = newDir == 'rtl';
     previewWorkspace = Blockly.inject('preview',
-        {rtl: rtl, media: '../../media/'});
+        {rtl: rtl,
+         media: '../../media/',
+         scrollbars: true});
     oldDir = newDir;
   }
   var code = document.getElementById('languagePre').textContent;