diff --git a/src/vs/workbench/api/common/extHostTypes.ts b/src/vs/workbench/api/common/extHostTypes.ts
index f02347835f8..ab6d9a7f6de 100644
--- a/src/vs/workbench/api/common/extHostTypes.ts
+++ b/src/vs/workbench/api/common/extHostTypes.ts
@@ -2729,7 +2729,7 @@ export enum DebugConfigurationProviderTriggerKind {
 @es5ClassCompat
 export class QuickInputButtons {
 
-	static readonly Back: vscode.QuickInputButton = { iconPath: { id: 'back.svg' } };
+	static readonly Back: vscode.QuickInputButton | { iconPath: string } = { iconPath: 'back.svg' };
 
 	private constructor() { }
 }