diff --git a/static/upvote.js b/static/upvote.js
index ee45491..d982637 100644
--- a/static/upvote.js
+++ b/static/upvote.js
@@ -26,6 +26,9 @@
         title: document.querySelector('meta[name="title"]').content,
       }),
       credentials: "include",
+      headers: {
+        "Content-Type": "application/json",
+      },
     });
 
     if (r.ok) {