diff --git a/src/play_clj/core_render.clj b/src/play_clj/core_render.clj
index 5c0f4d8..ba3677f 100644
--- a/src/play_clj/core_render.clj
+++ b/src/play_clj/core_render.clj
@@ -28,7 +28,7 @@
   (assert renderer)
   (if (isa? (type layer) MapLayer)
     layer
-    (-> renderer .getMap .getLayers (.get layer))))
+    (-> renderer .getMap .getLayers (.get ^String layer))))
 
 (defn tiled-map-layers
   [{:keys [^BatchTiledMapRenderer renderer]}]