diff --git a/CHANGELOG.md b/CHANGELOG.md
index d9ade70b..0f8f8c1e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 All notable changes to this project will be documented in this file.
 
+## Unreleased
+
+ * Fixed crash when zoom is maxed far out.
+
 ## 0.26.0
 
  * `HttpTiles` will now attempt to use already downloaded tiles with a lower zoom level as
diff --git a/walkers/src/tiles.rs b/walkers/src/tiles.rs
index 9e1101c2..e69d21c9 100644
--- a/walkers/src/tiles.rs
+++ b/walkers/src/tiles.rs
@@ -158,7 +158,7 @@ impl HttpTiles {
     fn placeholder_with_different_zoom(&self, tile_id: TileId) -> Option<TextureWithUv> {
         // Currently, only a single zoom level down is supported.
 
-        let zoom = tile_id.zoom - 1;
+        let zoom = tile_id.zoom.checked_sub(1)?;
         let x = (tile_id.x / 2, tile_id.x % 2);
         let y = (tile_id.y / 2, tile_id.y % 2);