diff --git a/quartz/components/Footer.tsx b/quartz/components/Footer.tsx
index d8c2d2a3d..fb121a38f 100644
--- a/quartz/components/Footer.tsx
+++ b/quartz/components/Footer.tsx
@@ -13,7 +13,7 @@ export default ((opts?: Options) => {
     const year = new Date().getFullYear()
     const links = opts?.links ?? []
     return (
-      <footer class={classNames(displayClass)}>
+      <footer class={`${displayClass ?? ""}`}>
         <p>
           {i18n(cfg.locale).components.footer.createdWith}{" "}
           <a href="https://quartz.jzhao.xyz/">Quartz v{version}</a> © {year}