diff --git a/src/vs/workbench/api/common/extHostNotebook.ts b/src/vs/workbench/api/common/extHostNotebook.ts
index 07bf51e1bb5..c5e7f1e7ea1 100644
--- a/src/vs/workbench/api/common/extHostNotebook.ts
+++ b/src/vs/workbench/api/common/extHostNotebook.ts
@@ -1099,6 +1099,7 @@ export class ExtHostNotebookController implements ExtHostNotebookShape, ExtHostN
 						e.editor.dispose();
 						e.onDidReceiveMessage.dispose();
 						this._editors.delete(e.editor.id);
+						editorChanged = true;
 					}
 				});
 			});