diff --git a/extensions/vscode-notebook-tests/src/extension.ts b/extensions/vscode-notebook-tests/src/extension.ts
index 7236c4dbca4..d555df6ca1f 100644
--- a/extensions/vscode-notebook-tests/src/extension.ts
+++ b/extensions/vscode-notebook-tests/src/extension.ts
@@ -69,7 +69,7 @@ export function activate(context: vscode.ExtensionContext): any {
 			const task = controller.createNotebookCellExecution(cell);
 			task.start();
 			task.replaceOutput([new vscode.NotebookCellOutput([
-				vscode.NotebookCellOutputItem.text('test output', 'text/html', undefined)
+				vscode.NotebookCellOutputItem.text('test output', 'text/html')
 			])]);
 			task.end({ success: true });
 		}
diff --git a/src/vs/workbench/test/browser/api/extHostTypeConverter.test.ts b/src/vs/workbench/test/browser/api/extHostTypeConverter.test.ts
index e766008f374..48cdcba4d13 100644
--- a/src/vs/workbench/test/browser/api/extHostTypeConverter.test.ts
+++ b/src/vs/workbench/test/browser/api/extHostTypeConverter.test.ts
@@ -90,7 +90,6 @@ suite('ExtHostTypeConverter', function () {
 		const dto = NotebookCellOutputItem.from(item);
 
 		assert.strictEqual(dto.mime, 'foo/bar');
-		assert.strictEqual(dto.metadata, undefined);
 		assert.deepStrictEqual(dto.valueBytes, Array.from(new TextEncoder().encode('Hello')));
 
 		const item2 = NotebookCellOutputItem.to(dto);