diff --git a/core/modules/utils/fakedom.js b/core/modules/utils/fakedom.js
index 85f57a503..5175cebc5 100755
--- a/core/modules/utils/fakedom.js
+++ b/core/modules/utils/fakedom.js
@@ -23,7 +23,7 @@ var bumpSequenceNumber = function(object) {
 
 var TW_TextNode = function(text) {
 	bumpSequenceNumber(this);
-	this.textContent = text;
+	this.textContent = text + "";
 };
 
 Object.defineProperty(TW_TextNode.prototype, "nodeType", {
@@ -66,7 +66,7 @@ TW_Element.prototype.setAttribute = function(name,value) {
 	if(this.isRaw) {
 		throw "Cannot setAttribute on a raw TW_Element";
 	}
-	this.attributes[name] = value;
+	this.attributes[name] = value + "";
 };
 
 TW_Element.prototype.setAttributeNS = function(namespace,name,value) {
@@ -139,7 +139,7 @@ Object.defineProperty(TW_Element.prototype, "className", {
 		return this.attributes["class"] || "";
 	},
 	set: function(value) {
-		this.attributes["class"] = value;
+		this.attributes["class"] = value + "";
 	}
 });
 
@@ -148,7 +148,7 @@ Object.defineProperty(TW_Element.prototype, "value", {
 		return this.attributes.value || "";
 	},
 	set: function(value) {
-		this.attributes.value = value;
+		this.attributes.value = value + "";
 	}
 });