diff --git a/quartz/components/scripts/explorer.inline.ts b/quartz/components/scripts/explorer.inline.ts
index 9c8341169..3c6851c7b 100644
--- a/quartz/components/scripts/explorer.inline.ts
+++ b/quartz/components/scripts/explorer.inline.ts
@@ -111,6 +111,10 @@ function createFolderNode(
   const folderPath = node.slug
   folderContainer.dataset.folderpath = folderPath
 
+  if (currentSlug === folderPath) {
+    folderContainer.classList.add("active")
+  }
+
   if (opts.folderClickBehavior === "link") {
     // Replace button with link for link behavior
     const button = titleContainer.querySelector(".folder-button") as HTMLElement