diff --git a/.changeset/popular-plums-love.md b/.changeset/popular-plums-love.md
new file mode 100644
index 0000000000..b921a5b100
--- /dev/null
+++ b/.changeset/popular-plums-love.md
@@ -0,0 +1,5 @@
+---
+'nextra-theme-docs': patch
+---
+
+add missing `nx-` prefix in sidebar
diff --git a/packages/nextra-theme-docs/src/components/sidebar.tsx b/packages/nextra-theme-docs/src/components/sidebar.tsx
index 1b53753462..87b1070778 100644
--- a/packages/nextra-theme-docs/src/components/sidebar.tsx
+++ b/packages/nextra-theme-docs/src/components/sidebar.tsx
@@ -149,7 +149,7 @@ function FolderImpl({
           )}
         />
       </Anchor>
-      <Collapse className="ltr:pr-0 rtl:pl-0" open={open}>
+      <Collapse className="ltr:nx-pr-0 rtl:nx-pl-0" open={open}>
         {Array.isArray(item.children) ? (
           <Menu
             className={cn(classes.border, 'ltr:nx-ml-1 rtl:nx-mr-1')}