diff --git a/src/index.js b/src/index.js
index f974904..e3ac056 100644
--- a/src/index.js
+++ b/src/index.js
@@ -100,7 +100,7 @@ async function initApp() {
 
   // Add headers so mapliber-gl decodes protobufs appropriately
   const staticTilesOpts = { 
-    setHeaders: (res, _, _) => {
+    setHeaders: (res, _u1, _u2) => {
       res.setHeader('Content-Encoding', 'gzip');
       res.setHeader('Content-Type', 'application/x-protobuf');
     },