diff --git a/index.js b/index.js
index 36420f3..831af5a 100644
--- a/index.js
+++ b/index.js
@@ -98,7 +98,7 @@ async function main() {
 
     app.post('/:instanceId', async (req, res) => {
 
-        const apikey = req.headers['X-BatchHttp-Api-Key'];
+        const apikey = req.headers['x-batchhttp-api-key'];
         if (apikey !== API_KEY) {
             res.status(401).send({
                 error: "Invalid API Key"