diff --git a/src/Umbraco.Web.UI.Client/src/packages/core/components/property-type-based-property/property-type-based-property.element.ts b/src/Umbraco.Web.UI.Client/src/packages/core/components/property-type-based-property/property-type-based-property.element.ts
index 1131038379..1bc1363a53 100644
--- a/src/Umbraco.Web.UI.Client/src/packages/core/components/property-type-based-property/property-type-based-property.element.ts
+++ b/src/Umbraco.Web.UI.Client/src/packages/core/components/property-type-based-property/property-type-based-property.element.ts
@@ -28,7 +28,7 @@ export class UmbPropertyTypeBasedPropertyElement extends UmbLitElement {
 	private _dataTypeData?: UmbPropertyEditorConfig;
 
 	private _dataTypeDetailRepository = new UmbDataTypeDetailRepository(this);
-	private _dataTypeObserver?: UmbObserverController<UmbDataTypeDetailModel | undefined>;
+	private _dataTypeObserver?: UmbObserverController<UmbDataTypeDetailModel>;
 
 	private async _observeDataType(dataTypeUnique?: string) {
 		this._dataTypeObserver?.destroy();