diff --git a/src/vs/base/test/browser/ui/tree/objectTree.test.ts b/src/vs/base/test/browser/ui/tree/objectTree.test.ts
index 0eee155ca90e087913912b72e24b1ff6360fae8b..3424665b1110df2bbfbaec86db1ea7ae689138fe 100644
--- a/src/vs/base/test/browser/ui/tree/objectTree.test.ts
+++ b/src/vs/base/test/browser/ui/tree/objectTree.test.ts
@@ -41,6 +41,7 @@ suite('ObjectTree', function () {
 
 		teardown(() => {
 			tree.dispose();
+			filter = (_: number) => true;
 		});
 
 		test('should be able to navigate', () => {