diff --git a/scripts/osm2pgsql/tilecountServer.ts b/scripts/osm2pgsql/tilecountServer.ts
index b1d7bce32..ec5de4b30 100644
--- a/scripts/osm2pgsql/tilecountServer.ts
+++ b/scripts/osm2pgsql/tilecountServer.ts
@@ -214,7 +214,7 @@ const server = new Server(2345, [
         handle: async (path: string) => {
             const layers = await tcs.getLayers()
             const meta = await tcs.getMeta()
-            return JSON.stringify({ meta, layers })
+            return JSON.stringify({ meta, layers: Array.from(layers) })
         },
     },
     {