diff --git a/src/vs/workbench/api/browser/mainThreadNotebook.ts b/src/vs/workbench/api/browser/mainThreadNotebook.ts
index d144bec6070d5260929052bc1ca3ea5abae3deee..b0c3cc0dadd8b2fe06d542e97819cfa552219227 100644
--- a/src/vs/workbench/api/browser/mainThreadNotebook.ts
+++ b/src/vs/workbench/api/browser/mainThreadNotebook.ts
@@ -18,7 +18,7 @@ import { INotebookCellStatusBarService } from 'vs/workbench/contrib/notebook/com
 import { ACCESSIBLE_NOTEBOOK_DISPLAY_ORDER, CellEditType, CellKind, DisplayOrderKey, ICellEditOperation, ICellRange, IEditor, INotebookDocumentFilter, NotebookCellMetadata, NotebookCellOutputsSplice, NotebookDocumentMetadata, NOTEBOOK_DISPLAY_ORDER, TransientMetadata } from 'vs/workbench/contrib/notebook/common/notebookCommon';
 import { IMainNotebookController, INotebookService } from 'vs/workbench/contrib/notebook/common/notebookService';
 import { IEditorService } from 'vs/workbench/services/editor/common/editorService';
-import { ExtHostContext, ExtHostNotebookShape, IExtHostContext, INotebookCellStatusBarEntryDto, INotebookDocumentsAndEditorsDelta, MainContext, MainThreadNotebookShape, NotebookEditorRevealType, NotebookExtensionDescription } from '../common/extHost.protocol';
+import { ExtHostContext, ExtHostNotebookShape, IExtHostContext, INotebookCellStatusBarEntryDto, INotebookDocumentsAndEditorsDelta, INotebookModelAddedData, MainContext, MainThreadNotebookShape, NotebookEditorRevealType, NotebookExtensionDescription } from '../common/extHost.protocol';
 
 class DocumentAndEditorState {
 	static ofSets<T>(before: Set<T>, after: Set<T>): { removed: T[], added: T[] } {
@@ -84,10 +84,9 @@ class DocumentAndEditorState {
 		const visibleEditorDelta = DocumentAndEditorState.ofMaps(before.visibleEditors, after.visibleEditors);
 
 		return {
-			addedDocuments: documentDelta.added.map(e => {
+			addedDocuments: documentDelta.added.map((e: NotebookTextModel): INotebookModelAddedData => {
 				return {
 					viewType: e.viewType,
-					handle: e.handle,
 					uri: e.uri,
 					metadata: e.metadata,
 					versionId: e.versionId,
@@ -640,4 +639,3 @@ export class MainThreadNotebooks extends Disposable implements MainThreadNoteboo
 		}
 	}
 }
-
diff --git a/src/vs/workbench/api/common/extHost.protocol.ts b/src/vs/workbench/api/common/extHost.protocol.ts
index 4b7946662950f18179a5b6e3552abd39e68ca80e..94a655ceb78824ce1ba8f0c1438fb0db44399a49 100644
--- a/src/vs/workbench/api/common/extHost.protocol.ts
+++ b/src/vs/workbench/api/common/extHost.protocol.ts
@@ -1648,7 +1648,6 @@ export interface INotebookDocumentPropertiesChangeData {
 
 export interface INotebookModelAddedData {
 	uri: UriComponents;
-	handle: number;
 	versionId: number;
 	cells: IMainCellDto[],
 	viewType: string;
diff --git a/src/vs/workbench/test/browser/api/extHostNotebook.test.ts b/src/vs/workbench/test/browser/api/extHostNotebook.test.ts
index 70070cd869b5a016c2d52d90112b13e3dd72fe29..2f6156164f1f7a100ca55c48a8bb32be8d360c1e 100644
--- a/src/vs/workbench/test/browser/api/extHostNotebook.test.ts
+++ b/src/vs/workbench/test/browser/api/extHostNotebook.test.ts
@@ -56,7 +56,6 @@ suite('NotebookCell#Document', function () {
 		});
 		extHostNotebooks.$acceptDocumentAndEditorsDelta({
 			addedDocuments: [{
-				handle: 0,
 				uri: notebookUri,
 				viewType: 'test',
 				versionId: 0,
diff --git a/src/vs/workbench/test/browser/api/extHostNotebookConcatDocument.test.ts b/src/vs/workbench/test/browser/api/extHostNotebookConcatDocument.test.ts
index f2ca94c32d5a11d6601921def310d0500a4dcf17..c9f18c332a97065f31f060995e7d8093620a0a86 100644
--- a/src/vs/workbench/test/browser/api/extHostNotebookConcatDocument.test.ts
+++ b/src/vs/workbench/test/browser/api/extHostNotebookConcatDocument.test.ts
@@ -56,7 +56,6 @@ suite('NotebookConcatDocument', function () {
 		});
 		extHostNotebooks.$acceptDocumentAndEditorsDelta({
 			addedDocuments: [{
-				handle: 0,
 				uri: notebookUri,
 				viewType: 'test',
 				cells: [{