diff --git a/src/client/theme-default/composables/outline.ts b/src/client/theme-default/composables/outline.ts
index a3f561d0..857fb141 100644
--- a/src/client/theme-default/composables/outline.ts
+++ b/src/client/theme-default/composables/outline.ts
@@ -48,6 +48,7 @@ function serializeHeader(h: Element): string {
       if (
         (node as Element).classList.contains('VPBadge') ||
         (node as Element).classList.contains('header-anchor') ||
+        (node as Element).classList.contains('footnote-ref') ||
         (node as Element).classList.contains('ignore-header')
       ) {
         continue