diff --git a/src/vs/workbench/api/common/extHostNotebook.ts b/src/vs/workbench/api/common/extHostNotebook.ts
index 298548f294a..434d48581ce 100644
--- a/src/vs/workbench/api/common/extHostNotebook.ts
+++ b/src/vs/workbench/api/common/extHostNotebook.ts
@@ -321,23 +321,6 @@ export class ExtHostNotebookController implements ExtHostNotebookShape, ExtHostN
 		this._notebookContentProviders.set(viewType, { extension, provider });
 		const listeners: vscode.Disposable[] = [];
 
-		listeners.push(provider.onDidChangeNotebook
-			? provider.onDidChangeNotebook(e => {
-				const document = this._documents.get(URI.revive(e.document.uri));
-
-				if (!document) {
-					throw new Error(`Notebook document ${e.document.uri.toString()} not found`);
-				}
-
-				if (isEditEvent(e)) {
-					const editId = document.addEdit(e);
-					this._proxy.$onUndoableContentChange(e.document.uri, viewType, editId, e.label);
-				} else {
-					this._proxy.$onContentChange(e.document.uri, viewType);
-				}
-			})
-			: Disposable.None);
-
 		listeners.push(provider.onDidChangeNotebookContentOptions
 			? provider.onDidChangeNotebookContentOptions(() => {
 				this._proxy.$updateNotebookProviderOptions(viewType, provider.options);
@@ -892,11 +875,6 @@ export class ExtHostNotebookController implements ExtHostNotebookShape, ExtHostN
 	}
 }
 
-function isEditEvent(e: vscode.NotebookDocumentEditEvent | vscode.NotebookDocumentContentChangeEvent): e is vscode.NotebookDocumentEditEvent {
-	return typeof (e as vscode.NotebookDocumentEditEvent).undo === 'function'
-		&& typeof (e as vscode.NotebookDocumentEditEvent).redo === 'function';
-}
-
 export class NotebookCellStatusBarItemInternal extends Disposable {
 	private static NEXT_ID = 0;