diff --git a/src/app/admin/students/page.tsx b/src/app/admin/students/page.tsx
index 0219e6b..eb23412 100644
--- a/src/app/admin/students/page.tsx
+++ b/src/app/admin/students/page.tsx
@@ -82,6 +82,7 @@ export default function StudentsPage() {
     try {
       const res = await fetchWithAuth("/api/admin/students/bulk", {
         method: "DELETE",
+        headers: { "Content-Type": "application/json" },
         body: JSON.stringify({ user_ids: selectedIds })
       })
       if (!res.ok) throw new Error("Delete failed")