diff --git a/tileserver/__init__.py b/tileserver/__init__.py
index 3ee0469..a0d30da 100644
--- a/tileserver/__init__.py
+++ b/tileserver/__init__.py
@@ -261,6 +261,7 @@ def handle_request(self, request):
             formatted_tiles, extra_data = format_coord(
                 coord,
                 nominal_zoom,
+                nominal_zoom+1,
                 processed_feature_layers,
                 (format,),
                 unpadded_bounds,