diff --git a/src/vs/platform/list/browser/listService.ts b/src/vs/platform/list/browser/listService.ts
index e3c42e0b054..e70bf539f65 100644
--- a/src/vs/platform/list/browser/listService.ts
+++ b/src/vs/platform/list/browser/listService.ts
@@ -430,7 +430,7 @@ export class WorkbenchTree extends Tree {
 	constructor(
 		container: HTMLElement,
 		configuration: ITreeConfiguration,
-		options: ITreeOptions,
+		options: ITreeOptions | undefined,
 		@IContextKeyService contextKeyService: IContextKeyService,
 		@IListService listService: IListService,
 		@IThemeService themeService: IThemeService,
diff --git a/src/vs/workbench/contrib/preferences/browser/keybindingsEditor.ts b/src/vs/workbench/contrib/preferences/browser/keybindingsEditor.ts
index 8d06fc22dcf..0437702abf9 100644
--- a/src/vs/workbench/contrib/preferences/browser/keybindingsEditor.ts
+++ b/src/vs/workbench/contrib/preferences/browser/keybindingsEditor.ts
@@ -29,7 +29,6 @@ import {
 } from 'vs/workbench/contrib/preferences/common/preferences';
 import { IContextMenuService, IContextViewService } from 'vs/platform/contextview/browser/contextView';
 import { IKeybindingEditingService } from 'vs/workbench/services/keybinding/common/keybindingEditing';
-import { List } from 'vs/base/browser/ui/list/listWidget';
 import { IListVirtualDelegate, IListRenderer, IListContextMenuEvent, IListEvent } from 'vs/base/browser/ui/list/list';
 import { IThemeService, registerThemingParticipant, ITheme, ICssStyleCollector } from 'vs/platform/theme/common/themeService';
 import { IContextKeyService, IContextKey, ContextKeyExpr } from 'vs/platform/contextkey/common/contextkey';
@@ -79,7 +78,7 @@ export class KeybindingsEditor extends BaseEditor implements IKeybindingsEditor
 	private keybindingsListContainer: HTMLElement;
 	private unAssignedKeybindingItemToRevealAndFocus: IKeybindingItemEntry | null;
 	private listEntries: IListEntry[];
-	private keybindingsList: List<IListEntry>;
+	private keybindingsList: WorkbenchList<IListEntry>;
 
 	private dimension: DOM.Dimension;
 	private delayedFiltering: Delayer<void>;