diff --git a/.changeset/fresh-llamas-stare.md b/.changeset/fresh-llamas-stare.md
new file mode 100644
index 00000000..7dad3c61
--- /dev/null
+++ b/.changeset/fresh-llamas-stare.md
@@ -0,0 +1,5 @@
+---
+"@primer/css": patch
+---
+
+Fix nested `<ul>` in footnotes
diff --git a/src/markdown/footnotes.scss b/src/markdown/footnotes.scss
index 05e7e45e..49278292 100644
--- a/src/markdown/footnotes.scss
+++ b/src/markdown/footnotes.scss
@@ -19,6 +19,12 @@
 
     ol {
       padding-left: $spacer-3;
+
+      ul {
+        display: inline-block;
+        padding-left: $spacer-3;
+        margin-top: $spacer-3;
+      }
     }
 
     li {