diff --git a/packages/autocomplete-js/src/autocomplete.ts b/packages/autocomplete-js/src/autocomplete.ts
index 95bb876c9..7d2fd8cdb 100644
--- a/packages/autocomplete-js/src/autocomplete.ts
+++ b/packages/autocomplete-js/src/autocomplete.ts
@@ -166,7 +166,7 @@ export function autocomplete<TItem>({
           const li = document.createElement('li');
           setProperties(li, {
             ...autocomplete.getItemProps({ item, source }),
-            class: concatClassNames(['aa-Item', classNames.Item]),
+            class: concatClassNames(['aa-Item', classNames.item]),
           });
           renderTemplate(source.templates.item({ root: li, item, state }), li);