diff --git a/map/src/map.rs b/map/src/map.rs
index 375eeaf..5d4107f 100644
--- a/map/src/map.rs
+++ b/map/src/map.rs
@@ -69,7 +69,7 @@ impl Map {
         engine: &Engine,
         scene: &mut Scene,
         maps: &mut HashMap<String, AssetPath>,
-        tiles: &mut HashMap<String, AssetPath>,
+        tiles: &HashMap<String, AssetPath>,
         entity_manager: &mut impl AssetLoader,
         build_path: impl Fn(&str) -> AssetPath,
     ) -> Result<()> {
@@ -88,7 +88,7 @@ impl Map {
         engine: &Engine,
         scene: &mut Scene,
         path: AssetPath,
-        tiles: &mut HashMap<String, AssetPath>,
+        tiles: &HashMap<String, AssetPath>,
         entity_manager: &mut impl AssetLoader,
     ) -> Result<()> {
         let sql_connection = MapDataBase::load(&path.full_path())?;
@@ -665,7 +665,7 @@ impl Map {
         engine: &Engine,
         scene: &mut Scene,
         data_base: MapDataBase,
-        tiles: &mut HashMap<String, AssetPath>,
+        tiles: &HashMap<String, AssetPath>,
         entity_manager: &mut impl AssetLoader,
     ) -> Result<Map> {
         let map_tiles = data_base.read_tiles()?;