diff --git a/npm/ng-packs/packages/theme-shared/extensions/src/lib/models/internal/object-extensions.ts b/npm/ng-packs/packages/theme-shared/extensions/src/lib/models/internal/object-extensions.ts
index ea8a9dad8f..776785ed4c 100644
--- a/npm/ng-packs/packages/theme-shared/extensions/src/lib/models/internal/object-extensions.ts
+++ b/npm/ng-packs/packages/theme-shared/extensions/src/lib/models/internal/object-extensions.ts
@@ -66,7 +66,7 @@ export interface ExtensionPropertyUiDto {
   onTable: ExtensionPropertyUiTableDto;
   onCreateForm: ExtensionPropertyUiFormDto;
   onEditForm: ExtensionPropertyUiFormDto;
-  lookup: ExtensionPropertyUiLookupDto;
+  lookup?: ExtensionPropertyUiLookupDto;
 }
 
 export interface ExtensionPropertyUiFormDto {