diff --git a/src/serve_rendered.js b/src/serve_rendered.js
index d647c8d..db0f877 100644
--- a/src/serve_rendered.js
+++ b/src/serve_rendered.js
@@ -821,6 +821,7 @@ export const serve_rendered = {
     }
 
     app.get('/:id.json', (req, res, next) => {
+      const tileSize = 512;
       const item = repo[req.params.id];
       if (!item) {
         return res.sendStatus(404);
@@ -830,6 +831,7 @@ export const serve_rendered = {
         req,
         info.tiles,
         `styles/${req.params.id}`,
+        tileSize,
         info.format,
         item.publicUrl,
       );