diff --git a/core/modules/widgets/ubertransclude.js b/core/modules/widgets/ubertransclude.js
index 73656f0b6..a21d1eabe 100644
--- a/core/modules/widgets/ubertransclude.js
+++ b/core/modules/widgets/ubertransclude.js
@@ -65,7 +65,7 @@ UberTranscludeWidget.prototype.execute = function() {
 	};
 	searchParseTreeNodes(this.parseTreeNode.children);
 	if(noValueWidgetsFound) {
-		this.slotValueParseTrees["missing"] = this.parseTreeNode.children;
+		this.slotValueParseTrees["ts-missing"] = this.parseTreeNode.children;
 	}
 	// Parse the text reference
 	var parseAsInline = !this.parseTreeNode.isBlock;
@@ -87,13 +87,13 @@ UberTranscludeWidget.prototype.execute = function() {
 				subTiddler: this.transcludeSubTiddler
 			});
 	}
-	var parseTreeNodes = parser ? parser.tree : (this.slotValueParseTrees["missing"] || []);
+	var parseTreeNodes = parser ? parser.tree : (this.slotValueParseTrees["ts-missing"] || []);
 	this.sourceText = parser ? parser.source : undefined;
 	this.parserType = parser? parser.type : undefined;
 	// Wrap the transcluded content if required
-	if(this.slotValueParseTrees["wrapper"]) {
-		this.slotValueParseTrees["wrapped"] = parseTreeNodes;
-		parseTreeNodes = this.slotValueParseTrees["wrapper"];
+	if(this.slotValueParseTrees["ts-wrapper"]) {
+		this.slotValueParseTrees["ts-wrapped"] = parseTreeNodes;
+		parseTreeNodes = this.slotValueParseTrees["ts-wrapper"];
 		this.sourceTest = undefined;
 		this.sourceType = undefined;
 	}
diff --git a/core/modules/widgets/widget.js b/core/modules/widgets/widget.js
index b2dba2705..cb3d5c7a2 100755
--- a/core/modules/widgets/widget.js
+++ b/core/modules/widgets/widget.js
@@ -403,7 +403,7 @@ Widget.prototype.makeChildWidget = function(parseTreeNode,options) {
 					type: "value",
 					tag: "$value",
 					attributes: {
-						"$name": {name: "$name", type: "string", value: "body"}
+						"$name": {name: "$name", type: "string", value: "ts-body"}
 					},
 					children: parseTreeNode.children
 				},
@@ -411,7 +411,7 @@ Widget.prototype.makeChildWidget = function(parseTreeNode,options) {
 					type: "value",
 					tag: "$value",
 					attributes: {
-						"$name": {name: "$name", type: "string", value: "wrapper"}
+						"$name": {name: "$name", type: "string", value: "ts-wrapper"}
 					},
 					children: [
 						{
@@ -426,7 +426,7 @@ Widget.prototype.makeChildWidget = function(parseTreeNode,options) {
 									type: "slot",
 									tag: "$slot",
 									attributes: {
-										"$name": {name: "$name", type: "string", value: "wrapped"}
+										"$name": {name: "$name", type: "string", value: "ts-wrapped"}
 									}
 								}
 							]
diff --git a/editions/test/tiddlers/tests/data/ubertransclusion/CustomWidget-Simple.tid b/editions/test/tiddlers/tests/data/ubertransclusion/CustomWidget-Simple.tid
index b370a5af8..7ec98e965 100644
--- a/editions/test/tiddlers/tests/data/ubertransclusion/CustomWidget-Simple.tid
+++ b/editions/test/tiddlers/tests/data/ubertransclusion/CustomWidget-Simple.tid
@@ -16,7 +16,7 @@ title: TiddlerOne
 <$set name="<$mywidget>" value="""\whitespace trim
 	<$parameters one='Jaguar'>
 		<$text text=<<one>>/>
-		<$slot $name="body">
+		<$slot $name="ts-body">
 			Whale
 		</$slot>
 	</$parameters>"""
diff --git a/editions/test/tiddlers/tests/data/ubertransclusion/CustomWidget-TextWidgetOverride.tid b/editions/test/tiddlers/tests/data/ubertransclusion/CustomWidget-TextWidgetOverride.tid
index 18ba964c8..7223a88aa 100644
--- a/editions/test/tiddlers/tests/data/ubertransclusion/CustomWidget-TextWidgetOverride.tid
+++ b/editions/test/tiddlers/tests/data/ubertransclusion/CustomWidget-TextWidgetOverride.tid
@@ -16,7 +16,7 @@ title: TiddlerOne
 <$set name="<$text>" value="""\whitespace trim
 	<$parameters text='Jaguar'>
 		<$text text=<<text>>/>
-		<$slot $name="body">
+		<$slot $name="ts-body">
 			Whale
 		</$slot>
 	</$parameters>"""
diff --git a/editions/test/tiddlers/tests/data/ubertransclusion/CustomWidget-VariableAttribute.tid b/editions/test/tiddlers/tests/data/ubertransclusion/CustomWidget-VariableAttribute.tid
index b7d6a4942..61a981f10 100644
--- a/editions/test/tiddlers/tests/data/ubertransclusion/CustomWidget-VariableAttribute.tid
+++ b/editions/test/tiddlers/tests/data/ubertransclusion/CustomWidget-VariableAttribute.tid
@@ -16,7 +16,7 @@ title: TiddlerOne
 <$set name="<$mywidget>" value="""\whitespace trim
 	<$parameters $variable='Jaguar'>
 		<$text text=<<$variable>>/>
-		<$slot $name="body">
+		<$slot $name="ts-body">
 			Whale
 		</$slot>
 	</$parameters>"""
diff --git a/editions/test/tiddlers/tests/data/ubertransclusion/MissingTarget.tid b/editions/test/tiddlers/tests/data/ubertransclusion/MissingTarget.tid
index 023384939..41743cf57 100644
--- a/editions/test/tiddlers/tests/data/ubertransclusion/MissingTarget.tid
+++ b/editions/test/tiddlers/tests/data/ubertransclusion/MissingTarget.tid
@@ -13,7 +13,7 @@ title: Output
 	</$parameters>
 </$ubertransclude>
 <$ubertransclude $tiddler='TiddlerOne' one='Ferret'>
-	<$value $name="missing">
+	<$value $name="ts-missing">
 		<$parameters one='Ferret'>
 			Badger
 			<$text text=<<one>>/>
@@ -27,7 +27,7 @@ title: Output
 	</$parameters>
 </$ubertransclude>
 <$ubertransclude $tiddler='MissingTiddler' one='Ferret'>
-	<$value $name="missing">
+	<$value $name="ts-missing">
 		<$parameters one='Ferret'>
 			Badger
 			<$text text=<<one>>/>