diff --git a/src/Umbraco.Web.UI.Client/src/core/services/modal/layouts/modal-layout-picker-base.ts b/src/Umbraco.Web.UI.Client/src/core/services/modal/layouts/modal-layout-picker-base.ts
index 6449933df1..01ab0fd905 100644
--- a/src/Umbraco.Web.UI.Client/src/core/services/modal/layouts/modal-layout-picker-base.ts
+++ b/src/Umbraco.Web.UI.Client/src/core/services/modal/layouts/modal-layout-picker-base.ts
@@ -6,7 +6,7 @@ export interface UmbPickerData<selectType = string> {
 	selection: Array<selectType>;
 }
 
-export class UmbPickerLayoutBase<selectType> extends UmbModalLayoutElement<UmbPickerData<selectType>> {
+export class UmbPickerLayoutBase<selectType = string> extends UmbModalLayoutElement<UmbPickerData<selectType>> {
 	
 	@state()
 	private _selection: Array<selectType> = [];