diff --git a/src/vs/vscode.d.ts b/src/vs/vscode.d.ts
index 8f254f8dec9..555187ec1d0 100644
--- a/src/vs/vscode.d.ts
+++ b/src/vs/vscode.d.ts
@@ -7287,6 +7287,12 @@ declare module 'vscode' {
 		 */
 		message?: string;
 
+		/**
+		 * The tree view title is initially taken from the extension package.json
+		 * Changes to the title property will be properly reflected in the UI in the title of the view.
+		 */
+		title?: string;
+
 		/**
 		 * Reveals the given element in the tree view.
 		 * If the tree view is not visible then the tree view is shown and element is revealed.
diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index b31d3ae366d..19bfef3caba 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -1076,14 +1076,6 @@ declare module 'vscode' {
 
 	//#region Tree View
 
-	export interface TreeView<T> {
-		/**
-		 * The tree view title is initially taken from the extension package.json
-		 * Changes to the title property will be properly reflected in the UI in the title of the view.
-		 */
-		title?: string;
-	}
-
 	/**
 	 * Label describing the [Tree item](#TreeItem)
 	 */
diff --git a/src/vs/workbench/api/common/extHostTreeViews.ts b/src/vs/workbench/api/common/extHostTreeViews.ts
index 15e80858930..54cc945d6ae 100644
--- a/src/vs/workbench/api/common/extHostTreeViews.ts
+++ b/src/vs/workbench/api/common/extHostTreeViews.ts
@@ -93,12 +93,10 @@ export class ExtHostTreeViews implements ExtHostTreeViewsShape {
 			get onDidChangeVisibility() { return treeView.onDidChangeVisibility; },
 			get message() { return treeView.message; },
 			set message(message: string) {
-				checkProposedApiEnabled(extension);
 				treeView.message = message;
 			},
 			get title() { return treeView.title; },
 			set title(title: string) {
-				checkProposedApiEnabled(extension);
 				treeView.title = title;
 			},
 			reveal: (element: T, options?: IRevealOptions): Promise<void> => {