diff --git a/index.js b/index.js
index c95d8c2..2c39133 100644
--- a/index.js
+++ b/index.js
@@ -41,7 +41,7 @@ global.auth = (req, res, next) => {
 	if(!process.env.API_KEY) {
 		return next(); // No API key set, allow all requests
 	}
-	if (process.env.API_KEY && req.headers['Authorization'] === process.env.API_KEY) {
+	if (process.env.API_KEY && req.headers['authorization'] === process.env.API_KEY) {
 		return next();
 	}
 	return res.status(401).json({ error: 'Unauthorized' });