diff --git a/demos/blockfactory/factory_utils.js b/demos/blockfactory/factory_utils.js
index 5da02f9c4..d8f9536fd 100644
--- a/demos/blockfactory/factory_utils.js
+++ b/demos/blockfactory/factory_utils.js
@@ -352,8 +352,8 @@ FactoryUtils.formatJavaScript_ = function(blockType, rootBlock, workspace) {
 
   var tooltip = FactoryUtils.getTooltipFromRootBlock_(rootBlock);
   var helpUrl = FactoryUtils.getHelpUrlFromRootBlock_(rootBlock);
-  code.push("    this.setTooltip('" + tooltip + "');");
-  code.push("    this.setHelpUrl('" + helpUrl + "');");
+  code.push(' this.setTooltip(' + JSON.stringify(tooltip) + ');');
+  code.push(' this.setHelpUrl(' + JSON.stringify(helpUrl) + ');');
   code.push('  }');
   code.push('};');
   return code.join('\n');