diff --git a/core/modules/utils/errors.js b/core/modules/utils/errors.js
index 73f60ae84e2..fac4b3fa779 100644
--- a/core/modules/utils/errors.js
+++ b/core/modules/utils/errors.js
@@ -8,11 +8,16 @@ Custom errors for TiddlyWiki.
 \*/
 (function(){
 
-function TranscludeRecursionError(depth) {
-	this.depth = depth;
+function TranscludeRecursionError() {
+	Error.apply(this,arguments);
 	this.signatures = Object.create(null);
 };
 
+/* Maximum permitted depth of the widget tree for recursion detection */
+TranscludeRecursionError.MAX_WIDGET_TREE_DEPTH = 1000;
+
+TranscludeRecursionError.prototype = Object.create(Error);
+
 exports.TranscludeRecursionError = TranscludeRecursionError;
 
 })();
diff --git a/core/modules/widgets/transclude.js b/core/modules/widgets/transclude.js
index ce51e21023e..35b4941bd84 100755
--- a/core/modules/widgets/transclude.js
+++ b/core/modules/widgets/transclude.js
@@ -39,7 +39,7 @@ TranscludeWidget.prototype.render = function(parent,nextSibling) {
 			// Hopefully that will land us just outside where the loop began. That's where we want to issue an error.
 			// Rendering widgets beneath this point may result in a freezing browser if they explode exponentially.
 			var transcludeSignature = this.getVariable("transclusion");
-			if(this.getAncestorCount() > error.depth - 50) {
+			if(this.getAncestorCount() > $tw.utils.TranscludeRecursionError.MAX_WIDGET_TREE_DEPTH - 50) {
 				// For the first fifty transcludes we climb up, we simply collect signatures.
 				// We're assuming that those first 50 will likely include all transcludes involved in the loop.
 				error.signatures[transcludeSignature] = true;
diff --git a/core/modules/widgets/widget.js b/core/modules/widgets/widget.js
index 1fe95178739..601ff68f92e 100755
--- a/core/modules/widgets/widget.js
+++ b/core/modules/widgets/widget.js
@@ -12,9 +12,6 @@ Widget base class
 /*global $tw: false */
 "use strict";
 
-/* Maximum permitted depth of the widget tree for recursion detection */
-var MAX_WIDGET_TREE_DEPTH = 1000;
-
 /*
 Create a widget object for a parse tree node
 	parseTreeNode: reference to the parse tree node to be rendered
@@ -494,8 +491,8 @@ Widget.prototype.makeChildWidgets = function(parseTreeNodes,options) {
 	this.children = [];
 	var self = this;
 	// Check for too much recursion
-	if(this.getAncestorCount() > MAX_WIDGET_TREE_DEPTH) {
-		throw new $tw.utils.TranscludeRecursionError(MAX_WIDGET_TREE_DEPTH);
+	if(this.getAncestorCount() > $tw.utils.TranscludeRecursionError.MAX_WIDGET_TREE_DEPTH) {
+		throw new $tw.utils.TranscludeRecursionError();
 	} else {
 		// Create set variable widgets for each variable
 		$tw.utils.each(options.variables,function(value,name) {
diff --git a/editions/test/tiddlers/tests/test-widget.js b/editions/test/tiddlers/tests/test-widget.js
index 9724c72b450..1c7665a5328 100755
--- a/editions/test/tiddlers/tests/test-widget.js
+++ b/editions/test/tiddlers/tests/test-widget.js
@@ -180,7 +180,7 @@ describe("Widget module", function() {
 		expect(wrapper.innerHTML).toBe("<span class=\"tc-error\">Recursive transclusion error in transclude widget</span> <span class=\"tc-error\">Recursive transclusion error in transclude widget</span>");
 	});
 
-	fit("should handle many-tiddler recursion with branching nodes", function() {
+	it("should handle many-tiddler recursion with branching nodes", function() {
 		var wiki = new $tw.Wiki();
 		// Add a tiddler
 		wiki.addTiddlers([