diff --git a/src/vs/workbench/contrib/notebook/test/notebookDiff.test.ts b/src/vs/workbench/contrib/notebook/test/notebookDiff.test.ts
index 4881945cbf4..cab9ddc108d 100644
--- a/src/vs/workbench/contrib/notebook/test/notebookDiff.test.ts
+++ b/src/vs/workbench/contrib/notebook/test/notebookDiff.test.ts
@@ -374,7 +374,7 @@ suite('NotebookCommon', () => {
 			assert.strictEqual(diffViewModels.viewModels[0].type, 'unchanged');
 			assert.strictEqual(diffViewModels.viewModels[0].checkIfOutputsModified(), false);
 			assert.strictEqual(diffViewModels.viewModels[1].type, 'modified');
-			assert.strictEqual(diffViewModels.viewModels[1].checkIfOutputsModified(), true);
+			assert.deepStrictEqual(diffViewModels.viewModels[1].checkIfOutputsModified(), { reason: undefined });
 		});
 	});