diff --git a/frontend/app.js b/frontend/app.js
index df8233c..a8a8267 100644
--- a/frontend/app.js
+++ b/frontend/app.js
@@ -2889,6 +2889,7 @@
       try {
         const data = await api("/api/bookmarks/toggle", {
           method: "POST",
+          headers: { "Content-Type": "application/json" },
           body: JSON.stringify({ vault, path, title }),
         });