diff --git a/src/vs/base/browser/ui/tree/abstractTree.ts b/src/vs/base/browser/ui/tree/abstractTree.ts
index f7c2386da0f..126639db497 100644
--- a/src/vs/base/browser/ui/tree/abstractTree.ts
+++ b/src/vs/base/browser/ui/tree/abstractTree.ts
@@ -316,8 +316,8 @@ export abstract class AbstractTree<T, TFilterData, TRef> implements IDisposable
 		return this.model.setCollapsed(location, false, recursive);
 	}
 
-	toggleCollapsed(location: TRef, recursive: boolean = false): void {
-		this.model.setCollapsed(location, undefined, recursive);
+	toggleCollapsed(location: TRef, recursive: boolean = false): boolean {
+		return this.model.setCollapsed(location, undefined, recursive);
 	}
 
 	expandAll(): void {
diff --git a/src/vs/base/browser/ui/tree/asyncDataTree.ts b/src/vs/base/browser/ui/tree/asyncDataTree.ts
index 59ed7b0e6de..8c524a866ef 100644
--- a/src/vs/base/browser/ui/tree/asyncDataTree.ts
+++ b/src/vs/base/browser/ui/tree/asyncDataTree.ts
@@ -311,8 +311,8 @@ export class AsyncDataTree<T extends NonNullable<any>, TFilterData = void> imple
 		return true;
 	}
 
-	toggleCollapsed(element: T, recursive: boolean = false): void {
-		this.tree.toggleCollapsed(this.getDataNode(element), recursive);
+	toggleCollapsed(element: T, recursive: boolean = false): boolean {
+		return this.tree.toggleCollapsed(this.getDataNode(element), recursive);
 	}
 
 	expandAll(): void {