diff --git a/core/modules/widgets/reveal.js b/core/modules/widgets/reveal.js
index 322cfc625..275875e41 100644
--- a/core/modules/widgets/reveal.js
+++ b/core/modules/widgets/reveal.js
@@ -25,7 +25,7 @@ RevealWidget.prototype.generate = function() {
 	this.type = this.renderer.getAttribute("type");
 	this.text = this.renderer.getAttribute("text");
 	this.position = this.renderer.getAttribute("position");
-	this["default"] = this.renderer.getAttribute("default");
+	this["default"] = this.renderer.getAttribute("default","");
 	this.qualifyTiddlerTitles = this.renderer.getAttribute("qualifyTiddlerTitles");
 	this["class"] = this.renderer.getAttribute("class");
 	this.animate = this.renderer.getAttribute("animate","no");