diff --git a/src/Umbraco.Web.UI.Client/src/packages/core/tree/types.ts b/src/Umbraco.Web.UI.Client/src/packages/core/tree/types.ts
index 3eba66e5e5..193370095a 100644
--- a/src/Umbraco.Web.UI.Client/src/packages/core/tree/types.ts
+++ b/src/Umbraco.Web.UI.Client/src/packages/core/tree/types.ts
@@ -2,7 +2,7 @@ export interface UmbTreeItemModelBase {
 	type: string;
 	name: string;
 	hasChildren: boolean;
-	icon: string | null;
+	icon?: string | null;
 }
 
 export interface UmbTreeItemModel extends UmbTreeItemModelBase {