diff --git a/types/vanilla-modal/vanilla-modal-tests.ts b/types/vanilla-modal/vanilla-modal-tests.ts
index 3f75db3cc8..69c98baf3c 100644
--- a/types/vanilla-modal/vanilla-modal-tests.ts
+++ b/types/vanilla-modal/vanilla-modal-tests.ts
@@ -1,3 +1,4 @@
 import VanillaModal from 'vanilla-modal';
 
 const modalInstance = new VanillaModal();
+modalInstance.open('#foo');