diff --git a/layouts/_default/single.html b/layouts/_default/single.html
index 7a5fd7b..9b68f55 100644
--- a/layouts/_default/single.html
+++ b/layouts/_default/single.html
@@ -25,6 +25,7 @@
     <span id="upvote-count">—</span>
   </button>
 </div>
+<script>window.UPVOTE_API = "{{ .Site.Params.upvoteApi }}";</script>
 <script src="/upvote.js"></script>
 {{ end }}
 {{ if not .Params.hideReply }}
diff --git a/static/upvote.js b/static/upvote.js
index 5abf255..131da67 100644
--- a/static/upvote.js
+++ b/static/upvote.js
@@ -1,7 +1,7 @@
 (async function () {
   // Define the slug
   const slug = location.pathname.replace(/^\/|\/$/g, "").replaceAll("/", "-");
-  const API = "http://localhost:3000";
+  const API = window.UPVOTE_API;
 
   const btn = document.getElementById("upvote-btn");
   const count = document.getElementById("upvote-count");