diff --git a/extensions/vscode-api-tests/src/singlefolder-tests/notebook.api.test.ts b/extensions/vscode-api-tests/src/singlefolder-tests/notebook.api.test.ts
index a067ba65a92..e4489090017 100644
--- a/extensions/vscode-api-tests/src/singlefolder-tests/notebook.api.test.ts
+++ b/extensions/vscode-api-tests/src/singlefolder-tests/notebook.api.test.ts
@@ -151,6 +151,7 @@ const apiTestSerializer: vscode.NotebookSerializer = {
 	teardown(async function () {
 		disposeAll(testDisposables);
 		testDisposables.length = 0;
+		await revertAllDirty();
 		await saveAllFilesAndCloseAll();
 	});