--- a/tests/src/interfaces/unique/definitions.ts
+++ b/tests/src/interfaces/unique/definitions.ts
@@ -24,7 +24,7 @@
 
 const collectionParam = {name: 'collection', type: 'u32'};
 const tokenParam = {name: 'tokenId', type: 'u32'};
-const propertyKeysParam = {name: 'propertyKeys', type: 'Vec<String>', isOptional: true};
+const propertyKeysParam = {name: 'propertyKeys', type: 'Option<Vec<String>>', isOptional: true};
 const crossAccountParam = (name = 'account') => ({name, type: CROSS_ACCOUNT_ID_TYPE});
 const atParam = {name: 'at', type: 'Hash', isOptional: true};